Pretty simple really, Just trace the box of the bose and mark the holes then cut it out. 3/4 is too think and the cone would come out during bass notes and hit the door panel. I still trimmed some of the meat away on the inside of the door panel to make sure they cleared.
Follow Ups
I just made a 1/2" plate out of MDF for my CDT HD'S - spddracer13:10:51 02/13/07