I'm in the process of putting together a Hypercube Evo, but I'm attempting to do it without using heat-insert nuts.
There's remixes available of most of the parts required, but I couldn't find a suitable extruder mount - one design eliminated most of the heat-insert nuts but still required some to support the endstops, and several other designs don't design the nut slot 'ceilings' to be printed without supports, requiring supports to be placed inside the nut slots which is a pain in the ass to remove.
I recreated the design in OpenSCAD, remaining faithful to the original design instead of trying to do anything new/innovative. The holes in the ceiling of the nut slots and endstop mounts are supported by bridges, allowing printing without supports.
If you've got bridging dialed in well on your printer, you shouldn't need supports. I placed supports under the extruder mount (where the fan nozzle goes) but nowhere else.
Make sure you follow the printing instructions (0.2mm layer height, 0.2mm base layer height) for this to print correctly.
Use a 0.2mm layer height and a 0.2mm initial layer height, so that your printer correctly prints the bridges that support the nut holes.
I printed mine using supports placed under the extruder mount (where the fan nozzle slides through) but if you've got bridging dialed in well then this isn't necessary.