Not sure if these help but my garage is similar to your 3 car wide. It's 36 wide, 1 bay 26 deep, the other 2 are 28 deep. The gable is on the front, collar ties running left to right are at 16 feet, outer walls are 12 ft. 3 9x9 doors. 3 lifts, outer 2 bays are used for car storage, center...