Renovating a large space previously covered with plywood. Area is 32 x 12, want to use drywall, my problem is that the studs are uneven in their spacing. Many are 24" on center but others are as large as 27". What Is the maximum spacing allowed or is 16" on center required by code as my neighbor seems to think? Also is the thickness of the drywall dictated by the stud spacing. Appreciate all the help I can get.