THANKS guys!
This is exactly the sort of caveats I was looking for.
A wise man once said it is more important to know what you don't know than what you do know. I'm not good with electrons, so I appreciate the help.
I am capable of checking the items cautioned about. I am using a separate power supply for the electronics side of things and the Keling 36v goes only to the Gecko 203V drives, which are 'unkillable' per Gecko, so hopefully I can't do too much damage if I go ahead with this scheme.
However, I'm thinking it might be wise for me to buy the Gecko 320 and a little NEMA23 36v servo motor to play with first. I have the stepper thing pretty well figured out, but this will be my first taste of servos. Objective is to get some experience under my belt doing a usefull project (repowering my stepper driven indexer) before I do my next mill conversion . . which will be 100% servo powered.
Thanks for the advice, much appreciated.