I just released my first upload to http://garrysmod.org, the MiniFort!
It has 2 floors, an automatic door, a super cool defence system, and it all fits inside a 4x4x4 PHX Cube! Well, almost!
The bottom floor contains the control system for defending the fort. This defence system comes in the form of a remotely controlled Airboat with guns. To drive the Airboat, just sit in the office chair and use the WASD keys as you would if you were actually sitting in the Airboat. The left mouse button fires the turrets. There is an RT camera attached to the Airboat, so you can see what you are shooting at. The PHX rt_screen is placed in front of the office chair for an all-in-one driving experience!
Upstairs is completely empty, so you can add whatever you want. There is no roof, so you can just shoot over the sides if you wish, or you can add auto-turrets or other mounted weaponry.
The MiniFort requires PHX 2 or 3 (SVN) and Wire SVN to be installed.
To use the MiniFort, just unzip the MiniFort.zip file, and put the SAV and TGA files in “X:\Program Files\Steam\steamapps*USERNAME*\garrysmod\garrysmod\SAVE”
The ZIP file contains the save game file, and the 3 images which appear at the top of the download page.