I have a CAD drawing which I can insert into a Word document for anyone who requests it, and would be glad to share details such as vendors I use to get my parts. But I would rather not post the details of my design on a website as I will be building these for sale.
Frame material is 1/2" square tubing with 1/16" wall (http://stores.ebay.com/TRINITY-METAL-SA ... viewQQtZkm).
Saddle is simply 2 straps forming a Figure-8, connected in the middle by a D-ring, all covered in bicycle inner tube!
All strapping and connectors from:
http://www.strapworks.com/NylonCamStrap.html
Fasteners were all socket head 10-32 screws.
8" diameter wheels:
http://www.northerntool.com/webapp/wcs/ ... =200199624
5/16" bolts for axles (Home Depot).
E-mail me for other details.