how to put a motor on this bike

anybody have an idea of how to put a motor on this bike?

paratrooperlg.jpg
 
electric hub motor.

looks alloy. looks like it splits in half. wt?
 
This bike LOOKS fully suspended. My bike has a rear suspension, and on hindsight I think the increase in unsprung weight on my "rigid to the axle" mount gives me a rougher ride. But my mount is admittedly very heavy and beefy (I chain pull nearly 300#), so maybe my example is a poor one.

Question: On more conventional bikes than mine, with rear suspensions, do frame mounts ride better than "axle" mounts?
 
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