I read your feelings on locations and understand the concerns. That said, I have the box speakers mounted in the cabin in the upper rear corners of the cabin roof. They work well, the sound is nice and the cabin top is thick enough the screw the mounting brackets into. There are some very nice box type speakers out there. There is also a wire chase already there to run the wires from the port to the starboard side. You could mount them on the front bulkhead with some type of speaker box behind them to seal them off from the workings of the locker and I think they would be fine. I overnight on mine with my son from time, and when in the bunk I've thought it would be nice to have speakers on that bulkhead so you could hear them better without turning it up as much. When riding or not in the bunk I think the opisite would be true and having them on the cabin top is better. I've thought about adding another pair in the copit area too. If I did, I would mount them in the same place as the factory does which is in the step up area. If you didn't put them there, you could mount some box speakers under the overhand above the rear windows. Those are the only places in the copit I can see mounting speakers. I think those 4 areas and the combo of box and flush mount are pretty much it. Good luck with your project.
