If you can get your barrel 36" diameter it will make a nice shower floor. Draw a 24" circle on the floor and stand in it. Or better yet make a 24" diameter loop with heavy wire or something similar. Hang a shower curtain on it and stand inside it. It will give you an idea of how you will fit. I did my whole bus open floor plan. I just used 2x4 stock to flesh in my shower floorpan. 4x4 feet. I sealed the floor with fiberglass bathroom panel. The I hang shower curtain around it. It is comfortable enough for a shower chair. I used magnet hooks to hang the curtains. When not showering they get stowed. It opens up the space. I am making a floor panel to set over it and hide the shower floor. Our toilet is across the way next to the king sized bed. No walls. We use painting tarps and magnets if We have guests and want privacy.
Most important is to do a mockup and see how it feels. Each of us feel differently about how much space we need.
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