Sorry, I missed that earlier post. The pieces of mudflap are attachment to the fan blades to reduce the clearance between the tips and the housing. There are a bunch of examples on Youtube. It is supposed to increase the efficiency / distance.
When I pulled the blower out of the shed to replace the RFM for the season, I decided against doing it. It threw snow fine last year but I am a tinkerer and it looked like a neat thing to try. When I saw how small the gap was it didn't look like it was worth the effort. I also had visions of one piece coming off and disturbing the balance of the blades when there wasn't time to mess with it.
The electric controls weren't difficult. It would have been simpler to use HD switches in place of the small switches controlling 30A automotive relays, but I wanted to mount the small switches on a cord in the cab. Up/down uses a linear actuator. Rotation is done with a surplus electric seat motor with some mods to the factory cranking assembly.