It seems on the HyperCube Evolution Electronics Enclosure the original designer has abandoned the project. If you use dual Z the standard Z linear rail brackets are in the way and the panels cannot be mounted unless you cut out a portion of the panels. I have remixed the brackets so that they are extended and mount to the top of the extrusion instead of the bottom and the panels can be installed without any modification to them. Enjoy!
May 11, 2019: Fusion 360 file added if anyone needs it.