you can base your design of this, with some support for the pedals and a chain attached to the middle wheel it's a good place to start.
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just rig a small bike chain rig
Hmm, that looks scarily similar to one I used to have. It was made out of wood and had the exact same wheels. And that thing was HEAVY! Just pushing it was hard enough, I don't want to know what pedals would be like... though with your setup there, it would be hard to add pedals, mostly because it would need a gear/chain which doesn't look like it would exactly "fit".