I’m building a detached 3 car garage. The dimensions are 41’8”L, 23’4'W, 18'H at the peak. Just shy of 1,000 square feet. Three garage doors, the roof is 8.5/12 and there is a gable in the center (9/12) and a dormer in the back in the center (3/12). The first stall has attic trusses and a...