[Michael 4499]

Originally Posted by Chak

Most WCD I've seen have the chain or the belt behind the wheels. I've always assumed that the intent is to protect the chain or wheel from caught when the robot is hit from the side. Are you concerned about that?

Edit: I'm going by the picture, I can't get the CAD either

Originally Posted by asid61

The picture you have is enough, although the model doesn't load for me; kind of odd.
Building on what Chak said, you may have trouble mounting bumpers on there without extending the front/back rails.
I love the lightening pattern (seems strong but light), and the use of what appears to be 2x2 tubing everywhere. Have you considered adding a bellypan for stiffness?

Close, it is 2x1-1/2 tubing everywhere and although not in cad there will be a carbon fiber plate on the belly of the chassis.