I think Clay's already building his on blanks for spinning and casting rods, just wanting some advice on what people like in their fly rods.
I don't know enough to be of much help. My rod is 9ft 6 weight. Medium action, probably. It was fairly entry level when I bought 15yrs ago for about $90.
I would think there would be a market, esp. if you were able to customize it as much as you do on your other rods. I like your site, but the way. Nice graphics and the build-your-rod tool is well put together.