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Josh with that setup you will need to do one of two things - you will need to bring the focal plane further out of the focuser, (by either cutting the tube shorter, or getting longer collimation bolts to bring the mirror further up the tube) OR you can get a lower profile focuser to bring the camera closer in.
Finding the rough location of the focal plane during the day time with a piece of translucent paper as per Gary's suggestion is a good idea. The location of the imaging sensor in various cameras should be available by a simple google search - all canon eos camera have the same distance from the metal flange at the front that the lenses attach to and the sensor which from memory is 44mm (maybe 46??) so then you can figure out roughly where the camera needs to be to get focus.
There are quite a few threads addressing this issue on IIS, so have a search around and see some of the solutions that have been used before. But when it comes down to it, it's just simple measurements, and getting the focal plane and the sensor in the same place.
Adam
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