I had one wheel powder coated and I wasn't happy with the result: the coating didn't get right into the join between the inner and outer so I grabbed the remaining 4 after shot blasting and spray painted them on a slowly rotating jig before low baking.Looking good! I couldn't help noticing your steel wheels have been powder-coated. I was cleaning mine last week and was quite disappointed that there was rust spotting through the coating.
Those grey ones seem to have turned out very well though - in fact I think the whole project is going brilliantly - well done Andy - and Rob of course