The commutator and brushes on your motor look great!
Having a tail-shaft is nice too. It opens up some possibilities. I wouldn't have been able to do a home-brew coupler the way I did without the tailshaft on my motor.
As for color scheme - gloss black with neon green lightning bolts!
Rich's nephew, Tom, who was out at the last EV build day also wants to build a n EV riding lawn mower. You will have to talk with him if you make it out to this weeks build.