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EricthePoolBoy Had this to say about the belts-
For Drive belts to connect the fan pulley and the electric motor, I used rubber bands. The crank pulley and electric motor pulley are setup to use a timing belt but I never got around to sourcing one. The teeth spacing is for a gates extra light timing belt. 1/8" wide, and .080" pitch."
The pulley system on mine uses Eric"s original parts,,,,and i haven't done the belts on my engine either,,, but i did find this part that i was going to use-
I haven't printed it- but if you message him,, he will be able to help you out more then me at this stage-