Hi Rowland,
Going by what I can see, all you need is the cable, guide cam with an st4 port, and a guide scope. You won't need to build anything.
If you can get the cable, you could use my guide cam and scope for a test run if you don't have them. Mine is a qhy5.
Do you have details of what you've developed to interface with the hand controller?
Links to pics would be good as well
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