Mike, Happy belated seventieth Birthday.
I'm intrigued with your riser jig. After clamping the riser into the jig do you use a router-table with a straight bit to shape it? And does the guide bearing follow the lower 3/4" plywood form?
I've been trying to make the riser for my (KennyM) D/R longbow...screwed up some nice pieces of wood trying to even out the fades.
-Tim Y