Here's the library of my little house thing I posted before.

Now, this is loving RIDICULOUSLY tedious, I don't even know why the forget I'm doing it.



Here's some of the bullstuff I had to do to make it aesthetically pleasing.



Alrighty.
As seen above, I already have a good sized library, so I'm kind of clueless to what I should make this underground area. I was thinking about a trading area/marketplace, and making the whole establishment really interesting by linking the marketplace to a whole mess of other cities, so if you think that's a good idea, let me know. I also had the idea of it being a storage area, but seeing as I use SPC, that would be pretty damn useless. So far I'm going with the marketplace, even though it would be even more useless unless I began to host. Also if you suggest any altercations that would make it look better, I'll think about it. Such as using glowstone instead of torches. Which is a good idea.
Which brings up another matter.
If someone will tell me how to use Hamachi to host for Minecraft, and how to use an already-made world for the server, I'll host this world and let you guys help me, or just look around if you're not in a helping mood.