Our local gaming group started an escalation style campaign based on the book Death World by Steve Lyons. In order to bring the game to life I began making some custom terrain. One of the things I knew I would want was a ton of cargo containers.
To begin I made the below container out of sheet styrene. I was very meticulous to ensure that every part was measured precisely and that all edges were square. I added the rivets using some scale rivet strips, although small diameter styrene rod would work just as well.
After it was built I went about making a few silicone molds. I used RTV silicone which is easy to mix in a 1-1 ratio and cures in about 4-6 hours. I order my silicone from Micromark.
After the molds were finished it was time to start casting. The resin I use is also a simple 1-1 ratio and cures in as little as 15 minutes. With three molds I can crank out a lot of these in an afternoon.
And here's a look at some of the containers used in a piece of terrain.