A Port is place where ships can transfer passengers and cargo. Classically a port is also referred to as a harbour and it typically means a seaport. But since we're not in 1700's anymore, an airport or even a spaceport also fit within this theme.
Goal
The main goal for the battle is to depict a port of some sort. And to put this into perspective with regard to the suggestions from the suggestions thread: a port encompasses more than just the docks, it also contains the warehouses, passenger terminals, shipyard, etc. Some cities are famous for their ports, think of Venice, Rotterdam, Hong Kong.
Deadline
The deadline will be roughly 3 weeks from now on Saturday 9th of May. As usual, the battle will be closed at the end of that day, at mignight GMT; for the closing times around the world, check here.
Basic Rules
Three screenshots max; from an official Valve Source engine game; custom content more than welcome. You can find the full rules here. If you've got any questions about the theme, the rules or the battles generally, either post in this thread or PM me.
So get mapping, post plenty of W.I.P. shots and don't forget to mark your final screenshots.
Enjoy & Good luck.