Yeah its Ali plate with some Ali T shape extruding attached for the simple reason that I couldnt get hold of some thick Ail to mill out at the time and the top and bottom also attach to it, but with accurate measurements its fine and very light now ive milled some waste material out.

The picture ive posted are my wheels before I lightened them, they was way to heavy so now they are over half the weight of the originals. The lightened ones are the ones on my profile. (oh btw the picture of the Vulkalon wheels belong to another robot owned by one Mr Stu!)

That CAD looks awesome like a mini Judge, well its good to see progress. What is the stats on the custom valve you are having made?.

Chris - ^_^