also, you could take the 4x1, rip it in half, and splice at the handle for whatever length you want. You can cut 10" off each end (leaving 80") and use one piece for a glue on riser and the other for overlays, etc. Then you could make a nice stiff handled whatever-you-want bow
Boards are easy enough to splice. I'd personally use a W splice, but a Z is effective and a touch easier.