If I were to utilize this adventure mode space, I'd most likely want to build some kind of redstone creation instead of a house. Hoppers, droppers, and such are excluded due to hiding inventory which would limit redstone timers and much more. If chest were still allowed, wouldn't it be just as easy to put a block on top of a chest to lock it? I guess some things will have to be discouraged with rules instead of commands. Interesting idea, i suppose i could take it of leave it depending on how restricted it gets.