Its been a while since I've posted on the forums, but I started playing blockland again and created another TF2 CTF. I thought that it would be a neat idea to have a DM that mostly consisted of underground activity. So here are a few pictures to show you the basis of the build.
Above-Ground Town:

Smoke Stacks:

One of the Bases:

Interior (Leading to the Sewers):

Passage In and Out of the Base:

Part of the Sewer:

A Crawl Space:

The Central Sewer Area:

So if you like what you see, stop on by sometime and jump in on the action.
You may rate X/10 if you like, and constructive criticism is appreciated.

Special thanks to Bushido, and his new sentry add-on for allowing me to have my first TF2 game with an Engineer.