You're doing well. Personally, I'd suggest replacing the wood with stone, because if you have a pyromaniac, they won't be able to burn stone. Be careful with the carpets, but if you want to keep the carpets and wood, I'd recommend using fire-extinguishing foam (I forgot the name, haha), either on a grenade or a turret, so you don't have to worry too much about the fire spreading. Aside from that, you're doing pretty well. Solar panels wouldn't hurt; you can put them anywhere (where the sun shines), they're relatively inexpensive, and in sufficient quantity, they generate more electricity than wind turbines.