I think your construction method is so unique. It is probably used in alot of placed, but I have not seen it done here very often, It is cool because you can really get a feel for what the inside is going to "feel" like and enable you to tweak before committing. Very nice work!
Looks like you just painted over OSB for the interior walls, the texture makes it looks like home sheetrock with a thick texture on it! Pretty cool! This is looking amazing and better than professional!!!