Nice place to stash those speakers. I followed Chem's stereo lead when it comes to tunes onboard, a bluetooth speaker with no holes or wires and it's portable to other craft or events.
My son is a welder he extended the metal angle on the rear of the trailer, I get the diamond plate from a place called metal superstore here in Wpg we have a metal bender to make the bends in it.
We got all the wiring done, gauges, int lights, stereo, bilge, live well nav lights, 12 volt sockets, seats installed, also the boat trailer guide on's almost ready for paint.