I have a 1979 25 and wanted to mount organizer and winch to the cabin roof. Archive post says you should cut into the headliner to put in a backing block for the winch, and also for access to back the organizer or clutches. Do you actually cut out a piece of the headliner large enough to put the backing block against the cabin top? I dont see how you could just make a cut in the headliner and slip in the backing block for the winch. Any advise on how to do the installation with backing, would be appreciated.Hank Schloemer