[asid61]

Why the dual colsons? And why not a smaller mecanum? This could be a lot lighter if you removed a colson and just used 4" mecanums.
Why are there two standoffs almost next to each other in the middle of the module?
Apart from that, this looks very neat. The lightening pattern is perfect and it all looks quite clean. The pivot looks very nice too, and should let you use a smaller piston. However, this could be a good chance to put the mecanum wheels on a suspension by maing those actuated instead of the traction wheels by swapping the two.