@ Bardd: The reason we aren't doing c-Chanel is simply because we have a sheetmetal sponsor lined up
@ MattC9: These are the mechanums :
http://www.andymark.com/product-p/am-0083.htm They are 8"
@davepowers: The just the frame weighed 10 to 15 pounds w/o motors and gearboxes. The gear ratio is 12.75 to 1 (the same as the toughbhox)