Thanks! Pretty happy with how it turned out, other than a bit of an illumination hot spot at the edge.
The dust prevention method which usually works for me, is to clean/degrease surfaces first with high % isopropyl, then hold at 90 degrees or upside down, while wiping/polishing the surface with a fresh, lens cleaning cloth and hit it with canned air immediately prior to reassembly. There is actually one slightly visible particle of dust on mine :-/ but it had more than that before it was opened haha.
dusk