Actually, would it be possible to make research trees for the Ground Force components? Just generic ones to increase their effectiveness, number of shots, etc? Or maybe make it so that we can design them?
So for example there'd be a few fields
Type - Anti-Personnel, Anti-Vehicle, Bombardment, Anti-Aircraft, Autocannon, or HQ (CE would stay the same)
Size - (Light, Medium, Heavy, Super-Heavy, Ultra-Heavy)
AP - (Dropdown menu from 1 to 50)
Damage - (Dropdown menu from 1 to 60)
Shots - (Dropdown menu from 1 to 6)
CIWS - (Can be blank, choose from pre-made CIWS made for ships, just resized maybe?)
FFD - (Dropdown menu from 1 to 3)
And various research could upgrade the ranges of these higher and higher. Just a suggestion I thought of while anticipating the renaming of components when a unit is designed, thought of "why not just build the components with research to make them better, and have that be designable?". It adds a lot more variety and player decision making for Ground Forces, like when you design the weapons, powerplants, defense, engines, etc for ships, just not as intense. Also helps solve the "Can't think of anything for Ultra-Heavy" problem you mention about having a while ago in (I think) a different thread.
If no on the designing the components themselves, what about just research to improve components?