Jay Nelson is a gifted artist/builder. His mobile designs were featured in Tiny Homes and Tiny Homes on the Move: an electric car on bike wheels; an 8′ dinghy that you can sleep inside (and carry a surfboard on the roof); a motor scooter with surfboard rack.
What’s surprising is that his carpentry (and building design) are also outstanding. I especially like the way he uses used wood.
This is a treehouse he built on Kaua‘i. It’s not finished (but close).