My garage isn't as big. It's a 20X20 Multi Building. Metal studs every 5 ft. I used 7/16" OSB turned on it side next to the slab. 1/4" pegboard up to where the curve starts, on the back wall and above the garage door. Where the sheets come together without a stud I used a piece of 12 gauge steel behind it at the top and bottom. In the corners where I needed a stud to screw to I added a 2X2. It's holding up pretty well, finished it in '97, 20 years old.
PS:
The garage door is 10X10 off center on the front with a walk through door on the front too. On the walk in side there is a wall 7 ft from that side wall. It has OSB on both sides and pegboard up 7 ft to the loft. I've run out of pegboard space.

