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Yeah, mounting the motor where the cylinder/head would have gone would've required a right-angle change of direction of the drive. If you think it's loud now imagine what it would be like with another set of gears (which would also eat power).
I'm thinking they could have cut away the engine cases and moved the motor inboard with a shorter coupling to tie it to the primary drive. Looking at the electric motor by itself and it's current location I'm thinking they had to use the standard main bearings to support a long coupling with oil splashing about in there to lubricate them.
It wouldn't be terribly difficult for a clever builder to roll something like this together out of a standard Honda 50/70/clone motor. A plate of aluminum bolted over the cylinder hole, a simple coupling made on a lathe, figure out a mount for the motor and away you go.
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