If 30 is the goal, piece of cake, like Alaskavan said, stretch a proven design (look at atomiczombie's designs) like the one in the pic.
drive one side of the wheel with the pedals, and the other with a 50cc lifan
If the budget were, say 3k (4 tops for the first one) one could easily do REALLY nice trike, with fiberglass body and canopy.
I could build such a beast at $30 an hour plus parts
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