Smallest shower/toilet room I have ever seen is a 3x4 ft with the toilet outside of the shower area. In a Casita it is 3 x3 but the toilet and sink is in the shower and some space is consumed by the attached black water tank. Could get the area down to 30 inches wide but I found that to be too small for me. Teen aged daughter hated the Casita.
I found the best place to look at efficiency was the inside of a sailboat. Most floor plans are online. Aircraft are better, but most don't have a shower.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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