Tolex the front panel. Staple piping around it. Then screw it from the inside front using cleats attached inside the cab. Do the same with the rear but screw it from the outside.
I would use 1/2" ply as the tolex is hard to apply to the inside corner cut-outs otherwise.
Make sure that you leave 1/8" gap around the panel before tolex/piping so that you can fit it into the cabinet opening.
Good luck!
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