Buckminster Fullers one piece Dymaxion Bathroom 1936

image from

I don't know for sure the dimensions of the bathroom but i think it is close to 2mx2m

from http://users.design.ucla.edu/~djvmc/24/bucky/bathroom.html

Operating Manual for Spaceship Earth - read online

 Art Tattler has a good page on Bucky

image from http://www.salsburg.com/ 

Buckminster Fuller FAQ: Fuller's Ideas About Human Society:  Critical Path