whats the smallest width i can fot 3 12's into..JL 12w6s...12 1/4 inches wide each...could i get away with 37" box width???..cutout diameter 11 inches...thats 33 inches with 4 inches to spare..inch on the ends and in the middle..for braces of 3/4 inch mdf...subs will take up 36 3/4 inches on outside.