Some good progress made.
It works reasonably well. It rotates but because the filter wheel of my QHY9 isn't round (more oblong shaped) it will get so far and then start to slip. I think a bigger toothed timing belt will do the trick.
Once that is done a bit of a clean up of some edges and a paint job and should be finished.
Some photos below and a quick video on youtube if you are interested.
https://youtu.be/zMVOT29cu-0
Cheers
Jeremy