Got some pics posted, on the side you will see the 4x8 plywood that will be hinged to swing up when setup at the beach. I will have screen behind the opening.I am planning to use hinged panels like this on all 4 sides for good airflow when at the beach. I also plan on putting small windows into the hinged pieces and a window unit in the front for camping at state parks or areas with electricity. I plan on having a queen bed in the front and 2 bunkbeds on each side on the rear side walls, the 2 top bunks will fold down to provide a back for a couch in combo with the bottom bunks. I am currently looking at water tanks to set in the frame to use for an outside shower. We mainly camp at the beach so it reallyis being geared towards that use.
Once finshed putting the plywood on I am going to use Durabak bedliner coating to paint and seal the wood with. Here is a link
http://www.cotelind.com/#durabak