This is a picture of our chassis, it isn't a WCD, but it is simpler for us to manufacture requiring only 2x1 al tubing, steel pop rivets, and a standardized aluminum gusset.
On the sides, you can see the gusset plates and the bolts that supported the intake structure. Our biggest problem with the chassis was the lack of super structure, made mounting many things harder, so depending on the game next year we will be adding a superstructure to assist in mounting game components.
Those plates to mount the intake structure were later modified, because they became increasingly cockeyed as the bolts deformed the aluminum tubing wall. Our solution was to create a wider contact structure and use 8 pop rivets to distribute the load better.
Also note it was in fact a 6wd later in the season, just not in this picture
http://team955.com/gallery3/var/albu...G?m=1394932723