I need to convert a 4'x3' upstairs shower to a bathtub that my wife can soak in - but that I can still shower in. The shower is in the corner of a small bathroom formed by a tiled wall shared with the bedroom forming a corner with a tiled exterior wall. A 3' glass shower wall and 4' of sliding glass doors set on the pan complete the shower. The water comes through the center of the 3' of tiled wall shared with the bedroom. There's an additional 6" of space outside the shower on the opposite side, between the glass and the side of the toilet tank. The drain is in the center. Are there 50" bathtubs out there or do I have to frame in a couple of low walls and tile the whole thing? I was planning on just tearing out and replacing the old tile and pan but then I was hit with this request. I could sure use some ideas!