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After realising that it can actually be done, the most challenging thing was getting everything the correct size - went through a lot of 3D print prototypes. Then a mini USB camera allowed me to look inside and confirm all was lined up correctly.
With the gear ratio of 3.2:1 I didn't have to modify anything on the mount because the pulleys are a reasonable size. Just took out the cogs and the faceplate/PCB/motors - they can be put back in later if I want. I could go to a higher gear ratio but would have to do a bit of filing on the inside of the mount - rather not tackle that.
I'm just finishing off a new PCB that can be attached inside the mount faceplate. There's plenty of room there.
Be interesting to see how you go with the fork. 360 teeth is the same as a G11 and quite a few have gone direct drive with that using 0.9 degree steppers / 32 microsteps.
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