Concept Bikes & Bike Innovation - for better or worse

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A tilting trike I designed. Rear panels swing upwards, and rear screen rolls up, to let the kids out. Also the kids seat back folds for carrying larger cargo. Panels are 3-layer-plywood and seats are 7-ply. Shown with a 6'6" man riding so it looks a little cramped, but he does fit. Constructive criticism welcome!

How does drive get to the wheels?
And how does one steer to the right?

I was wondering (and I'm sure that someone who knows about the losses involved in such an idea will be able to dismiss it) if you could pedal a generator that powers a motor that turns the rear wheels. Could you make such a drive system as efficient as a chain?