This renovation occurred in an airlift-only community. Cost was $40,000. Every piece of wood was re-used. I did all the design, except for the triangular entryway, where I worked with a colleague.
Below is a Lego model prepared for Science World Vancouver. Yes, I designed it completely myself. No, there is no glue, but it holds together fine. It ways about 60lbs and is 6' long.