On the whole, I was very impressed with the design. It uses electrical conduit as the main construction material. This stuff is cheap and potentially available recycled from construction sites. Pipe bending and brazing is an easy construction technique with lots of possibilities -- I haven't designed anything myself yet, but it's on my list! The trailer has held up well these 2.5 years. I have since graduated, but EcoHouse residents continue to use the trailer.
The plans on the Pedal People website gives step-by-step instructions, so I won't try to repeat that here. I just hope my pictures can help those in the building or designing process. I misplaced my pictures of the trailer in use, but I made a particle-board bottom with slots cut for the ribs. This guy has hauled lots of stuff (and people) -- I love it!