Anycubic Chiron Support Cable-chain Remix

Gr8 design, I remix for my needs with following changes :

Resized the bottom piece holes for M3 screws, usefull for using M3 drop-in t-nuts

Modified the top piece :
- Use reverse as the original thing, to get cable chain going to bottom. With the original mount to top, I didn't have enough cable to get full travel on Z axis.
- Added 2 holes for a zip tie to keep cables in place, and add clearance for the cables.
- Mount on top stepper motor screws instead of bottom, as is it protect th