Shagglehod

So this seems to be a bit tricky, or else I'm missing something. I hate how all of the rooms are connected with huge openings, it feels insecure. What are some tricks and possibly examples of how to create doorways, if it's even possible at all? I've found barely anything resembling wall segments and facades.

More valuables! I have a vault in my base and while the money is good, what kind of evil lair's base is complete without various forms and stack sizes of GOLD and other precious metals? Possibly more jewel stuff, as well. I figure this should be relatively easy to implement.