MCamb-
Before modifications it was 20kg build up as single speed.
Is there a wattage formula somewhere? Would be nice to know what sort of power output is required so one can judge whether motor is required or not.
I think I am of the opinion that if you can't ride a bike without a motor support you definitely should not be using a motor to do so. Being physically able to control the bike is necessary for it to be safe and if you take on a loaded bike you can't ride and put a motor on it it ends up even heavier and harder to handle. That is a recipe for failure.
When my granny turned 80 they bought her a electric bike so she could ride well into her old age. First time she tries it she looses control over it (because of the weight) trying to get on and falls and breaks her hip. She hasn't been able to ride a bike since.
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Hulsroy
That could easily be done. But this bike is not heavy so motors are not necessary.
I would like discuss motors on bikes actually. I think it is a bit of a slippery slope.