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Chris, I buy the k8055 from ocean controls in melbourne pre-assembled, I have been happy with their service.
You can use Gray code scaling which is preferrable to using a on/ off encoder. The gray code does provide some error correction from overrun after the motor has stopped but the dome inertia moves it further. Using the k8055 board you can use the gray code or a simple on/off transition, remembering the overrun errors will be reset every time the dome passes the home switch. Most dome manufacturers do not use gray code, rather the simple on/off transition and rely on the home switch to reset errors that have accumulated over time.
Brett
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