Go check these guys out:
Cincinnati's Only Bicycle Cooperative | Mobo Bicycle Coop
Bike co-ops are generally staffed by cool bike-geek volunteers who live to talk, advise, and debate all things bike. They are typically stuffed to the gills with donated used bikes and parts for sale cheap; if you're willing to dig through bins of stuff.
Tell them what you have in mind, and they'll have suggestions. Plus they'll have the tools and expert advice to help you get the job done. Typically there's a nominal stand fee.