Oh, yeah, and servos on the camera mount for auto alignment. Don't want to forget that one!
So what you really want is a drum scanner, but you'll settle for a computer-controlled copy table adapted to a digital camera. Not at all difficult.
The Open Camera Controller can be a start on how to control a DSLR. The Arduino page has notes on steppter motor interface. The Gimp has a batch mode and ScriptFu that can stitch the images together and do some other stuff if you like. The rest is commodity hardware.
Hmmm, I only have a point & shoot, and I'm not upgrading just yet.
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