Nice digs, dude! I'm a sucker for anything built up in the sky.
I got a server last week and have been building on it with some friends.
I generate a topo view of the map every night: Link
The square on the left side, near the center line, is the spawn point. North of that is mostly where we've built. That bridge going all the way across the water is the result of my girlfriend and I getting totally lost in a massive cave system. When we came out to the surface, we had no idea where we were so we built a house and stored our loot. Once I figured out where we were relative to our usual building area, I built a bridge across the water, placing torches along the way.
I'll probably replace it with a proper path in the future, but for now at least we can find our way back.