If you made it over 4m posts, you'd have more than enough room to have a layout like Dr Andy did, which works superbly well.
The brown is the living are, the green a small kitchen and the blue the shower room. You go through the kitchen to get to the shower room, and it won't make the outside look crappy, as you can have it made in wood rather than concrete. Even wooden floors.
There may be some good pictures in Dr A's thread about them.





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