I think you let the gang vote. Use that poll option and post it under the pow wow with all the bow that are entered. Leave it open for x number of days and who gets the most votes wins for the most part.
But use other points for say tie breakers, like who used the most recycled materials. ie old, belt for hand, old barn board for the bow, old cutting board for tips overlays and stuff like that. I mean you could have several extra points.
tips, overlays, underlays, rest, handle and the bow it self.
Just a brain storm, Oh and you would want to set a sign up date then a start and close date.