Tronxy x5s single Z motor conversion

This is my try to convert the Tronxy x5s to single Z motor drive.

Parts needed (to purchase) :
- 2 GT2 40T pulleys, 8mm bore (one for each threaded rod)
- 1 GT2 20T pulley, 5mm bore (for motor)
- 1 1220mm closed GT2 belt
- 2 Threaded rods, 8mm x 500mm long. I think the original ones are too short for this mod. Need to try !!

Parts to pick from you existing printer :
- 2 KFL08 bearing flange (the ones that are on top of the threaded rods)
- One of the Z motors.

Since the motor pul