Yeah, the rifle platoons and BA I'm not 100% set on. I feel like basic rifle platoons work well to represent the DCMS' general disregard for conventional forces. That may just be considered good enough for units intended for base security, keeping civilians in check and engage in urban combat, if necessary.
Overall, I hadn't picked a concrete point in time this unit represents, but was going for a general post-Bulldog / Jihad vibe. The reason I picked the Raiden over other suits: to me, it seems like the most common suit the DCMS is fielding. And as they will likely do most of the front line fighting, I felt that light suits could be too fragile. I'm curious, though, why would you prefer the Kage or Kishi?
(I was for a time considering mixed companies of AC/5 field guns and BA, maybe even Kanazuchi, but decided against it in the end)
A general problem of this TO&E is the lack of organic APCs. But there's only so much that can be done. Loading 4 heavy APCs would be possible, of course, there's spare tonnage enough. But they would require another squad's worth of troop accommodations for the drivers. Which would necessitate cutting the ambulance, scout, field kitchen or HQ personnel. In the end, the rifle platoons and BA would have to rely on friendly tank units for offensive operations or have to be deployed defensively.