Angus,
It looks VERY impressive indeed. When you mentioned in IRC you were going to take an Ametek apart I was thinking it'd couldn't be rebuilt to factory quality level (and told you so too... 
. But I must admit your job looks at least as good as the original one. I have at times too saved wound rotors (from series commutator motors, as found in drills etc.) to convert to a radial generator (with outer rotating magnet drum). I've even started to unwind some but quickly given up on the task. It takes a lot of effort and care/concentration/accuracy to do it. Kudos.
One thing I notice is that you seem to have filled the slot with more wire than was originally there (higher slotfill). Which is good, I think. But one thing I would add and for which I hope there is still room left is some kind of slot cover to keep the wires in the slots, even though this will be a slow-running generator. In induction motors they sometimes use small, thin (.5 mm) strips of GFRP (epoxy circuit board without the copper). You could perhaps cut up some strips and carefully shove them in? I'd also definitely try to varnish or otherwise secure the windings.
Again, an impressive job.
Peter.
