Repairing rear arm rests

One more thing. I am considering making a speaker box that will fit where the arm rests are in my '67 Barracuda convertible. I will then make a new arm rest for the top. Even though my side panels are far from perfect I don't want to cut speaker holes in them. If the boxes come out good I will probably make a set for my son's Dart. Then fix arm rests for the GTS convertible.