Thanks pll and KnottedYet for your responses!
Indeed, I didn't see anything on this board on handcranks, but I was sure someone here might know of the subject, at least to guide me. Turns out I was right.
I will take both of your recommendations and keep y'all posted on the progress we make.
I'm especially grateful for the link to one-off handcycles, since I hadn't found their page during my earlier research. I'm thinking those folks might be the best ones to answer some of my questions, so I'll email them directly.
Gracias to everyone,
MuddyTrails




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