Stop in for a cup of coffee

Any garage door i have hung,has no drywall under the brackets. I use plywood and real lumber. The torsion bar works hard,and drywall breaks under the brackets.
My shop door,10x10 was fun. Its parts and pieces i scavenged. Door itself was new i bought from kijiji,rails and spring were from a door that was removed and scrapped. My torsion spring is 6” diameter,its big. Somehow its been working for 3 years.