Update: I now have a perfect rectangle with the feet secured to my workbench. I put a carpenters square against the backside of my middle assembly and its slightly out of whack. For the life of me (even by taking it apart and starting fresh) cannot figure out why. The only thing that doesn’t seem right is the bolts that secure the bearings to the front side of the xyz part seem to dig into the xyz parts and push them out. That and the xyz part seems to do that on its own by not allowing the xyz part from sitting forward enough on the sides where it bolts together. I’d post pictures but every time I try it tells me they are too big.