I have room for a 27X24 shower base, where my pottie is now. So far we have not wanted to compromise the space for the occasional use, it could still hold the pottie if it was a short one. A sink of perhaps 24X30” with cushions for a back might work as chairs are about 18+ deep, not 30” Home showers of 32”X32” seem small but we are in a van!