Soos - Love your camper top - I'm partial to red vehicles, too. One time I camped next to a guy who had much the same setup you describe. He had a very large screen room attached to his tailgate opening. His truck bed was his bedroom and the larger screen room was a living room and kitchen with all his comforts. Cookstove outside, of course. Hope you can find a solution that is as comfy as his was. I believe his screen room had panels that tied down to enclose the room and I do believe he had a porta-potty setup in one corner with privacy drapes, but I didn't get to go inside to check it out!
Pooker