MK3 and MK4 power armors (bigger grid, larger inventory), also adds various equipment (Night vision MK2, Energy shield MK3, Fusion battery, Singularity...)
Mods introducing new content into the game.
Armors or armor equipment.
Not sure if this is even possible
Portable nuclear reactors should get a neigbor bonus if you put them in side by side (or maybe even just multiple in at the same time)
lower the base output, from 300kw to 150-250kw but increase it for every other reactor in the suit
I'm pretty sure it is possible, and I certainly like the idea, although I'm not sure I have the chops to pull it off. Thanks for the idea though!