Running power to new amplifier

[rpasquarello]

Running power to new amplifier from the port batteries and I am wondering the best way to do this. I am thinking that somehow the panels on the interior port side of the rear berth come out. I am thinking that I could see the waterlines and run them past that. Does anyone know how to remove those panels? I think that they should be removable.

 

[rpasquarello]

Additional photo of stereo location ....sample not from my cabin or exact year but close enough