I've been using the conversion for just over a month now and everything is going great
For the conversion you need:1x 500mm MGN12C linear rail1x m5 heat insert4x m3 slotted nut16x m3 Square Corner Lock Nut (10x10x10)36x M3x8 Allen screw
For other sizes such as a 500, you will need more screws and square corner lock nuts
The author remixed this model.
I modified the original joiner to mount a second rail