Bondo - At least you were Sanding Upside down - while you were in a Shop!
I work on my truck outside all the time - in a parking lot at my apartment building - and luckily - tenants have accepted the process!
So far - there are three places I have had discovered that might help with the coating and fibreglass work, and have only checked out but one of them. Two more to go - Due Diligence and all. :-)
I have not done any of the mockup work for any Bombardier Projects, but my intro into Aerospace as a profession began with a Kitplane - the RV-3 from Vans Aircraft - wherin I bought a Kit from someone working on it - and after getting it home discoverred some of his big structural errors - wrong tools used for Riveting the Spar - led me to a BC Tech School and to a new career in Aircraft Maintenance -> Aircraft Production. The
RV-3 was my dream - but living in an apartment - suggests - try something else I can do in the mean time! Hence - EV's and the AeroCap!