Thanks for that advice Phil, I have looked carefully at your 'option' installations, and Dennis, very useful photo's.
The questions may come thick and fast now I am back in build mode......did you fit your M/G, before fitting the front plate, that holds the power supply.?
I am trial fitting the P36 Mount to the rotation motor, the M3x8 cap screws seem short....??
We had a couple of friends visit today...Tony is an electrician , he was amazed at the power of the drive motors.....as he said 'you could pull a tank with those'.
I have invested in a Digital Multimeter, while Tony was here I picked his brain, and asked him to explain how to circuit test for faults.
I have been very careful when disconnecting the wiring, but you never know, I should now be able to check for a wiring problem.....not that I am expecting any.

...mick