Version 1 was built using information obtained from the website BuildYourCnc.com
The 608 bearing sliding on Aluminum angle concept was not only simple but brilliant.
Since access to basic wood working tools like table saws was scarce in those days, the designers made due with whatever crooked piece of lumber that could be obtained from the local hardware store. While the rail system worked flawlessly the drive system was another story.
Eventually, the makeshift couplers would give way to proper jaw couplers with the flexible rubber spider, however the problems with the threaded rod could not be solved. The issue is that for threaded rods (and this applies to lead screws) to work as a drive system, they must be sufficiently stiff. This can only achieved one of two ways: make it thicker (and heavier) or pull it tightly. Lead screw costs climb quickly as the length increases. If the screw is pulled, then the threads will wear out faster, and it vastly increases the resistance of the system.
Pulling the lead screws is an impractical approach, which was found out because it was attempted on this machine.