I found it in YouTube, in a channel with James Turner. He put up his build, and also the shell-build so that you can download that and build your thin, tiny home. I uploaded mine to the gallery today, I hope someone likes it.
I you want try yourself, look for: TheSimSupply, that is his nick. If you want to see my build, search after Ingemo.
It was fun, but stairs take up so much space. I have been muttering about stairs the thole buildingtime.