A good solution, thank you, but the Numatic actually worked quite well. I had one of those venturi coolant mixers but I sent it back and got my money refunded, as the mixing ratio quoted was miles off what I could measure with my Brix gauges
So Phase Two starts :-
Firstly the six castors. It seems that I'd drilled and tapped to fit them, so getting them off was easy with no struggling to reach nuts - probably why I did it that way!
Then I removed all external labels, door furniture, operating handles, locks, catches, captive bolts etc. Then for the operating panel. This is not an 'unplug' job - some is but most is hard wired. I worked out that there was just enough cable length to remove it from the front door, and fold it back into the cabinet. I wrapped it in bubble wrap, and as luck would have it the 3 phase sub-panel cardboard box was just the right size to secure it in, and tie it with the ubiquitous baler twine.
The main input 125 amp socket I knew was going to be an issue to remove. Held on by four M6 bolts into thread inserts, but one had cross threaded and pulled the insert out of the panel, and getting to he rear was pretty impossible being more than I could reach through the internal electronics from the other side. There was JUST room to grip it in a Mole Grip, closing it with the tips of my fingers. Mole grips tethered with another bit of baler twine, as when (if) the screw comes out the Mole Grips will plunge into more inaccessible space below. However a quick application of the rattle gun to the bolt head working against the inertia of the mole grips got it off, and as expected they went crashing into the depths but was able to be pulled out by string.
So I think that's Phase Two completed

Major paint stripping and rubbing down next. I think that I will swathe the internals in dust sheets - do all the stripping and rubbing down, then remove the dust sheets and mask up properly before spraying.
I'm in two minds how to handle the doors. As they are at the moment they would just lift off their hinge pins, and that would make preparation of the frame somewhat easier, and preparation of the bottom edge of the doors would be a lot easier. I may lift them off, prepare them and the frame, spray the frame then re-hang the doors for spraying. Not decided . .
