Before I start I just want to say that William won't be obtaining any Mobile Suits until a certain era as I plan for him to obtain a certain type of Mobile Suits
He might obtain a few intact wrecks floating in space for study and for William's personal use. However, mass procurement will be halted until that certain era arrives as I plan to use a certain type of MS as the mainstay of William's fleet for many years to come.
Not to mention the UNSC is technologically superior in many aspects, so obtaining the early ones would have little use.
Let's take the UNSC Mantis for example, that little 5.7 meters high mech has even more energy output than a 20-meter tall Gundam.
A Mantis has 2 Fusion reactor that generates 750 kW each, making a total of 1,500 kW energy generation!
That's way more than the RX-78-2 Gundam (the original Gundam pilot by Amuro) who only has an energy output of 1380 kW.
Granted while in almost all other aspects the Gundam would outperform a Mantis, such as top speed as the RX-78-2 is said to have a max speed 165 km/h while the Mantis can only achieve 55.5 km/h.
But that's primarily due to the fact that Mobile Suits has thrusters, on their feet they would be hard press to catch up with an ordinary civilian vehicle.
Having played Gundam the PS2 as a child I still remember those dammed escort missions. Without using the thrusters these Mobile Suits are as slow a hell and a car would actually outrun a Gundam.
Saying that there are however Gundam size mechs in Halo such as the Mega-Mantis.
As for the Colossus? Its ass is too THICC for my taste so I'll go with the Mega-Mantis which has nicer legs.
As for the specs? Due to the fact that I couldn't find any information on the Mega-Mantis. I have decided to simply just use the specs of the regular Mantis and multiply it accordingly to its height, although there's the square-cube law so the engine output would actually be much bigger but this is just a general estimate anyways.
In this case, the height of a Mantis is around 5.7 meters while a Mega-Mantis having similar heights to a regular MS would be around 19 meters tall.
So that means multiplying the Mantis's specs around 3.5 times.
Which would make its total energy output to be around 5,250 kW. The same as Neo Zeon's Doven Wolf from Gundam ZZ.
That's a good engine, so good in fact that it can be used till the Late Universal Century, and its speed will be bumped out to 194.25 km/h! Much faster than the original Gundam.
Naturally, as the Mega-Mantis doesn't have thrusters it will be a planet base unit.
-story start-
"We have the latest news on the advances of Zeon's forces, they have now captured..."
William watches the news as the Zeon forces landed in Central Asia, and proceeds onward into Europe and the Middle East.
being more or less familiar with the Gundam series William is not the least bit concerned as he knows that Zeon would never capture Europe... well maybe eastern Europe but as for England? No, he's actually quite safe in England.
The North American continent tho, they're screwed as there will be heavy fighting there, in fact, 2 Zeon invasion forces landed both the East and West coast of America.
Anyways seeing nothing remarkable happened William turns off the TV. he begins looking through his timetable as he has a lot of things to do, meeting various people and signing contracts...
looking at the packed schedule William could only sigh as he wished Chloe could grow faster and deal with these troublesome matters in his stead.
After a week of grueling work he has finally finished most of them with only a few more errands remaining, a few particularly stubborn individuals popped up causing a few hiccups in his plans but BB is very confident that those stubborn people would in time eventually fold. Faced with an AI that can do untold amounts of calculations per second, William took BB's word for it.
As he's waiting for those people to finally surrender, William is trying to devise a scheme to kidnap Aina Sahalin, while a few months away he should really start planing it now as there would be a lot of calculations and planning involved in this, he naturally needs to be stealthy about it and masks his approach.
His current plan is to find where Aina piloting a Zaku meet Shiro (protagonist of 8th MS team) and did battle. According to his memory, after they did battle and both of their Mobile Suits broke dawn, they headed for the ruined hulk of a sunk federation ship for cover where they both first meet face to face for the first time.
Now the key to this is finding that sunk federation ship. unfortunately, he's not a mega Gundam fanboy enough to be able to tell what type of shi it was, so failing that while he couldn't track Aina, William could however track Shiro, Shiro's back story was that he was a survivor from side 2 where he survived Zeon's G3 gas attack.
A gas attack survivor name Shiro from side 2 should be easy enough to find with BB, so all he has to do is track him, find out when he gets transferred to the 8th MS team, calculate his flight path and find any out any wreck that matches his memory.
And there you go, all that's left to do is incapacitate and capture Aina.
unfortunately, this would have to be done by William himself as the kids just started their training so it really doesn't leave him much choice on the matter. he would be wearing ODST armor just in case Aina gets feisty and shoots him. William would be equipped with a covenant cloaking device (to stay hidden), few flashbangs (to stunt the target and Shiro if Shiro does get involves ), a shock stick to knock out Aina, and a few high-grade explosives to make everyone think that Aina died.
William will also need a cloaked Pelican for the insertion and extraction.
After that comes the real problem as he has to think of some way to get her on his side, but with her duty-bound Zeon pilot who wants to revive her family, William highly doubts that she would just go along with his plans without much of a fuss.
...
A bit later
William thought for a bit and through the power of all the entertainment media he has consumed, he has finally devised a brilliant yet ingenious scheme of seducing her.
So William's master plan involves putting her on putting her in stasis for a few years so that when she wakes up her brother and every she knew would be no more.
At that time William could just "casually" explains to her that his company found her wounded body floating, they tried out a few highly experimental treatments on her.
At this time he could let an AI do the medical explanation with some made-up bullcrap, an AI should be able to make a convincing enough lie right? He could also throw in that Zeon is gone and so is her brother.
At this point, he'll let her be for a bit as she'll probably do some crying, after she composes herself William would then give her a tour of the Halo which should awe her.
From there it's dating sims time! William could arrange a few scenes from a dating, such as a hot spring scene, a beach scene and so on.
Thinking that with all those dating sims, William smiles evilly as he is fairly confident that he got this in the bag.
With the general outline of the plan done, William began issuing what BB despite being an AI but could only make out as a string of bizarre orders.
'Why is the Creator asking me to find a gas attack survivor from side 2?'
'What oddly specific description... this can't be just random guesses as the Creator even mentioned the targets name'
'Why is the Creator suddenly ordering the construction of a hot spring on Installation 01? Could it be for the children?'
Such thoughts preoccupied most of BB's time as his "creator" is really quite a mystery and very baffling at times.
A month later
William just got news that the Federation has recently taken an interest in his gunpowder formula as his gunpowder formula performs significantly better most of the ones in the market. so now they're looking for his company to see if he can produce a gunpowder formula that's suitable for Mobile Suits or an upgrade for their current tank shell propellant.
This is of course isn't as easy as just putting the same gunpowder as on the pistols on a larger shell and calling it a day.
No, its much more complicated than that as even pistols and rifles have different gunpowders, not to mention a weapon suitable for a 20-meter tall robot. Now William could just bust out Scorpion tank shells and calls it a day but he's very hesitant on giving them military-grade weapons, so far the weapons he has on the market are what the UNSC considered obsolete, and giving them military-grade weapons would be very counter-intuitive to that, now wouldn't it?
So now he (more like BB) will have to work on making something that's better than what they've got and yet not as advance as to even be considered military grade.
There's also the problem of the fact that he'll be under heavier scrutiny now he's getting military fundings for research, he'll have to actually start hiring researchers just to masks that he's "pulling the answers for his test out of thin air".
'Geez what a pain' William thought as he looks at the pile of paperwork on his table, most of which concerning his new military contract.
Selling weapons that you've already patented is one thing, getting money for research and development is another. William has considered not accepting the contract but it would do him well to at least present himself as a useful tool to the military, so that they may be on his side if some "minor" problems popped up. Said "minor" problems would naturally be referring to any problems that may arise from his orphanages.
Speaking of his orphanages, his orphanages have recently been set up and are now accepting children.
'hopefully, none of these people would be the nosy type' William thought as he looks through the orphanage staff lists.