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Thanks for all the feedback guys, it's much appreciated. As I mentioned, I have long term goals of having complete remote control of my scope via a PC (similar to Bird, give or take 6.1 inches of Mirror), so I'll let you know how thinks go with the PC control version of the focuser.
I also like the idea raised by Rajah235 to use a belt drive, it would avoid the accuracies required aligning up the gears and will remove any slack. My only concern may be the stress the belt might put on the servo drive shaft, though it's probably minimal.
Another variant that avoids the use of setting up a 555 circuit and dismantling the remote control controller would be to leave the remote control receiver connected to the servo motor and control it using the remote control controller (wireless). The only thing still needed would be to modify the servo motor to allow continual rotation.
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