could i say...tear down all my water and food rooms and replace them with half as many nuka cola rooms?
or does the nuka cola room produce less of each because it produces a little of both?
oh, and someone said you need endurance to run it?
Yeah, you need endurance. It's a fun thing to have if you want to make your vault look neat but it's a lot more expensive (the final upgrade, with 3 merged rooms, costs 45000 caps) than the alternatives and by the time you unlock it, you're not gonna have any shortage of dwellers to spread out on two rooms. I have one myself, but only because I thought it looked cool.