In support of a bicycle workshop I have decided with my friends to build a trailer to carry the tools around the city.
We were not skilled in welding iron frames, but that didn't stop us, and with some advice we succeeded in building a nice, strong, and effective trailer, which remembers me an ancient Roman "biga".
[first two pictures are created with pixlr express]
Step 1: The pieces
We started to cut an old and cheap mountain bike frame, so that we had different measures tubes. As wheels I found a pair of children bike forks, so to have an easy wheel connection and to use 20" wheels, not big as 26" but not as tiny as a cart. The green tube comes from another old bike frame, it has an elliptical section, and it matches very well with forks' heads.