[BJC]

You could probably move all the outer wheels a couple inches further out. They appear to be at least 8 inches inside the frame. Also, if the bumpers have to be all the way around the robot as in the last several years the need for the chassis extensions infront of the wheels diminishes except for as a bumper mount. Eliminating that and using the bumpers themselves solidly connected in the corners (such as a single piece bumper) allows you to place your wheels even further out.

Very nice looking chassis, Bryan