Glad to see some interest in this again.
I still have mine, but I need to put a diode in it to replace one that burnt out. It was a 1200V 30A diode, so I don't know how it failed, max I saw was ~350 V at ~1.5A, wound with 30 gauge wire. That is with a max of 12V on the variac rectified.
I might eventually wind another stator with 18 gauge wire like Stans original.
Also need to build the pulsing circuit to pulse the field windings, have all the parts waiting...
The big deal is getting the proper size cell for it. My cell is too small, so I did not continue testing it very much. So a few things left to do to get it tested properly.
As far as dipping the stator, yes this is a good idea, but only if the thing works... You could test it for many hours before the vibrations would wear through the insulation, but as soon as you figure that the winding configuration is useful, then you should dip it. I tied my wire up, but never dipped it because I didn't get to that point in the testing.
I have a 1/2 hp motor, and it runs fine as long as you don't turn up the variac too much, but this may change if you have a much larger cell or thicker stator wire.