I see, now. Verey elegant design. My mental picture was close, but I had envisioned the upper and lower offset as driven by the design of the grip, not as a function of the assymmetry of the upper and lower curvatures. The actual design, then, is more simple; achieving the advantageous wrist orientation while maintaining a clean, unbroken form from end to end.
I took some time to explore the kyudo website; the art/discipline of kyujutsu is very interesting. Will you be using your handmade yumi in the practice of kyudo?
informally, yes, or at least I hope to do so.
there are no kyudojos anywhere near me.