Armor

I'd like to add to this.

Armor slots, for all body, think of fallout's armor system strictly for armor equipping, repair, and maintenance (although a hassle would give rise to new machines for repairing damaged items) additional structures to be built.

Add into this, actual power armor(say it requires energy cells to fuel it), and different tiers of armor based on the resources you find. I guess get as wild as you want with that. Limited only by the resources available for manufacturing.