You may already have seen pics of a stock V-20 cuddy but this is the way they finished them at least in 1986. Th long cut out in the floor is perfect for a porta potty but not sure how you would make that work with what you have. Not sure what you have under that plywood you have in there now ...maybe you can modify it. The way my stock set up is works pretty good , cut out for the porta potty, flat section for cushions and laying down and alot of storage on the shelf around the perimeter.
