My understanding is that Shimano and Campy pull different amounts of cable depending on the shift, while SRAM is the same for every shift. That doesn't seem to have been a problem for Zinn's frankenbike, but it could be for your combo. I'm interested to see how it goes though. It could be a nice alternative for putting integrated shifters on a bike with a mountain cassette (touring, cyclocross, etc). The double-only front might be an issue of course.