They build it in their indoor plant. Check them out AlpineStructures.com 30x28 10’ walls 6-12 pitch . Ceiling should be 11’ 7” for a 2 post lift. 6” concrete floor. They put it up in 1 day.
look awesome....i had to go custom and the maximum i could go is 599 sq/ft concrete slab.....once i got 600mor more, thats a whole different level headaches from the city.....i cant even do radiant floors.....so i have a 599 sq/fr slab that can fit 2 mustangs front to back on the left and 1.5 on the right