well, i think fuels don't really fit this game too well. underground things? maybe, but lack of resources in the area is not a problem, as with upgraded suit and cobble road you can go super far and come back even without oxygen tanks. automation seems pretty good idea, but i'd rather implement drones, as additional buildings in the middle of your indoor farm could mess up your base and it seems highly unpractical. and it also works for trees outside. also using drones for smelting and crafting could be pretty handy, as if you have to make like 20 habitat modules or 400 cobble, doing it yourself can be sometimes quite annoying. idk, like placing orders, maybe? and adding more energy sources seems great, like wind turbines. and lightning adapters made from lightning rods or being some kind of upgrade to them sounds like woah, like instead of draining your energy, filling batteries to max capacity. btw if RTG is miniature atomic power plant, at least 1 gear should be needed to craft it, as that pretty much how it would work. unless it's some kind of futuristic tech.