I'm considering building a new commuter bike and would like to use a disc front brake on it (spare me the disc vs. rim brake discussion, my mind is made up there ). I never realized how rare 700c disc brake wheels were until I started looking for a set. I found the Cane Creek Strados wheels for $400 which look like they'd do the trick for me as they appear to have a rim brake rim as well as disc hubs (I'll be using a cantilever brake on the rear).
I'm attempting to get some cost out of my proposed build though and while looking at options for doing that I got the idea of using a set of wheels that I already own to build this bike. The wheels are Mavic Open Pro rims with Ultegra hubs. My idea was that I could remove the Ultegra hub from the front wheel and replace it with a 6 bolt disc hub (along with new spokes if necessary) and save myself close to $300. Am I missing something obvious? I'd love if I could do this as not only would it be a fun experience building a wheel but my commuter dream bike will be much more likely to happen if I can axe that much cost off the build.