rick fetters wrote: (clip)I was thinking about using a large S.S. sald bowl for the 'nosecone' and tail-end and weld both to a galv. sheetmetal cylinder (clip) ^^^^^^^^^^^^ I can see how the design your are describing would be very eye-catching, but, unless you really value the "streamlined" look, I think you can do better. Making it out of two large metal salad bowls an sheet metal will probably make the trailer heavier than necessary, and I doubt that, with a trailer, you will be pedalling more than about 15 mph most of the time, so air resistance is probably not that important.
I build mine using a large plastic storage container with a hinged lid. The chassis was welded up out of electrical conduit, which is cheap, light, and easily formed. I used a pair of 20" front wheels, and two front forks. I towed it by attaching the tongue (conduit) with hose clamps, using 1" Tygon tubing, to a Tee on my seatpost. The Tygon was flexible enough to allow me to turn, and the trailer to tilt going over bumps.
The only problem I had was that my plastic box rested in the frame without fasteners, relying on its weight. When I had no load, the box tended to bounce around. This would be easy to overcome with some sort of straps or clamps.