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I gave it to the folks at Binova and they did it for me. So basically i have no clue and that is scareing me aswell.
I got the system for free and it works quite ok but I am thinking about converting it back to muscular power from time to time. To be independent from electricity and get back a normal Q-factor. I feel like a duck on it now. Also that big lump of plastic looks way crappier than some nice classic silver mountain bike cranks.
They are developing a smallish motor for the back hub right now, hopefully i can get one to test because that seems like the sleekest solution to me.
A 90l concrete bucket is cheap and fits quite nicely.