I have gutted my travel trailer in order to rebuild with an open floor plan. I am stuck on the bathroom, however. I really want a big shower, pedestal sink and high sitting toilet. I have very limited funding but several rv's to scavange from. I want to know if i can cut and piece together bathtub/shower inserts to make a bench seat or do i have to build one from scratch? I have red guard, a bunch of air mattresses, lots of vinyl plank flooring, lots of tile, lumber, liquid rubber, foam insulting panels. And more odds and ends. Any input would be greatly appreciated!