I came across this presentation about renovations of the display hangar(s) that started in 2018 at the Museu Aeroespacial in Brazil. It's in Portugese, but there are enough pictures to understand the work that is going on. To summarize, the roof panels and exhaust systems are being replaced, the floor is being rebuilt, and new lights are being installed. Check it out for yourself:
Museum in Transformation
_________________
Tri-State Warbird Museum Collections Manager & Museum Attendant
Warbird Philosophy Webmaster