Minor update, installed the 5/8" acme screw for the X axis using a 3/4" push bearing in the uprights. NEMA 17 motor connected with a 6mm to 5/8" coupler. . Z plate has 2040 openbeam installed. Next step is to mount the Y axis acme bolt, motor and hardware.
The Z axis will be removable to swap different cutters/heads that can easily be bolted onto the 2040mm openbeam.. After that, the only parts that remain are the 5/8" threaded rods and the electronics.