If you are serious about wanting a great polish and finish on your AS, suck it up and drive to Helena OH to P&S. We tried to do it ourselves, up on scaffolding with unfamiliar tools, and us in our late 60s then. I looked down and thought one fall and the hospital bill would have paid for this. P&S has done a lot of work for us. They do this every day, one after another. They have more experience in doing it right the first time than maybe even the factory (maybe). Go to Helena and leave it with them. We got our 1990 29' Excella done in 2012 or 2013 and people constantly stop us to complement us on our beautiful AS and ask is it new. You don't want 2nd best so hitch up and go to Ohio.
2016 GMC Sierra Crew Cab 2500 HD 4x4
6.6L Duramax + Allison, 3.73 axles