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Yeah, the eq platform as linked in above posts rotates the base, so all you have to take care of is the altitude.
The ETX and Ioptron setups electronicly control altitude and azimuth.
With the wedge or tilting slidey thinggo they have, the azimuth axis is lined up with the SCP so as it rotates around in AZ, you get the correct field rotation on the scope. the altitude of the scope is automatically adjusted aswell...
You can get GOTO systems for dob's but they are not eq, and not suitable for photography.. they do offer tracking (some do anyway.. Search the forums for bartelized dobs) but, these systems can not compensate for field rotation... I have no doubt with the right tools and a very technical mind, you could probably do it.. but not cheaper than you could buy a HEQ5 Pro or EQ6 Pro...
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