I'd like to ask what the point for making this thing transformable is. The technology to reach all these specs with Mecha alone is already plausible, things like acceleration aren't well defined on the site, moving fast in atmosphere can be accomplished with shields (though the Mach 3.4 vs Mach 6 is noted, it's not really enough to justify alone) , and it limits its AMBAC and weapons capabilities.
What aside from rule of cool justifies adding this transformable system? What special thing can it do that absolutely requires transforming? Why waste the resources on a more costly and harder to repair transformable?
I'm not bashing the transformable niche, I might make my own someday if I can think of a good reason -- I just think a convincing and concrete reason for it should be stated. Some non game-breaking yet notable starfighter-eqsue capability that the Mecha simply can't use or something. The change in atmospheric speed is a start, but not enough alone to justify the cost or the complexity in my mind.
Also, Omni-Directional Vectored Thrusting translates at minimum to whiplash and at worst to a destroyed frame since this thing it light. It's not like a CDD, where such force isn't actually exerted for instantaneous movement.