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Interesting project that I'll watch with interest.
If it's any help I built a controller for my Super Polaris so I could autoguide it. I used the Freeduino board as it is functionally equivalent to the Arduino Uno but has a crystal oscillator. All I had to do was add a couple of ULN2003 drivers and a 7809 regulator on some veroboard for it all to work. Input commands are serial text and the hardest part was writing an ASCOM driver for it.
Even wrote a PEC routine which didn't really work out - great in theory but not so effective in real life.
With more time I wanted to add manual controls. My preference was to try rotary encoders rather than buttons in order to emulate the manual slow motion controls.
Happy to share code etc.. if it helps
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