We built a plywood chassis last year, it was a different design, as the wood was used to support the axles directly, and it was based on the "box" concept. Not much twisting going on with a box!
http://www.chiefdelphi.com/forums/sh...ad.php?t=71902
The strange overal design was due to having to harvest balls from the floor, and the trailer let us use a wide 4wd design instead of the narrow 6wd that most games seem to require.