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Hi Graham
I don't think you would come anywhere near the PMX payload capacity. The metal version RC is about 17kg, feather touch FOCUSER about 2kg, camera about 1.5kg, AO unit about 1kg. Any other bits and pieces would add minimal weight. So all up you have less than 22 kgs of equipment.
I think the payload capacity is 41kg for the PMX? So if the mount has a good PE, it is likely to continue having a good PE with your gear. That said, an AO unit will generally give tighter stars and as a consequence make it more apparent when the RC is not collimated i.e. the blur circle no longer hides star shapes.
Whatever ends up being the optical train, you will definitely need a sliding counter weight somewhere at the front of the RC tube to balance a very back heavy instrument.
Ted
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