While waiting for Astro Bob to weave his magic on our group buy, I felt the need to make some stuff
With these 8 pole motors I think a sensor spacing of 30 mechanical degrees will work the same as 120 mechanical degrees, but will make the wiring neater.
Glue 8 small magnets to the rotor with alternating polarity
Screw or clamp the perspex plate to the back of the motor so that it can be rotated slightly to adjust the timing
Fix the rotor to the motor shaft with grub screws and dimples (to make re-location easy)
This should be useable with the 3210 or 3220 Astro motors. If the motor does not have a double shaft , I guess you could drill and thread the back of the shaft to add an extension for the rotor.
Now all I need is a motor to try it out