Just get a photo printed out and a fresh piece of 1/4 hardboard or plywood on your bench first. Then take a hand full of finish nails and a piece of fiberglass , Formica, or .030 uniweft works good too, and bend it around until you get the shape you are looking for and use the nails to hold its shape….. it’s called “Carpenter Cad”.
Laugh if you want…..but it actually works rather well….
After you have traced the shape on your 1/4” material, cut it out, sand it smooth and then use one pattern for both limbs. Kirk
Btw…. Every one of my limb designs were done this way….