Thanks cadunkle! The wood is raw pressure treated. Glued and screwed. I briefly looked around at HDPE but the price of it drove me away.
Some more progress pics. I decided to keep the larger piping for anything that touches the fiberglass and ill use a smaller piping for the seats. I ran new wiring for the speakers and cup holder LEDs. Waiting on the LEDs to come in so i can finish up the cup holders and install.
Im currently searching for a good deal on a button press and so I can make some matching dura snap buttons for mounting all the panels