The guy created the Mother of All Motorhomes out of an old military truck of some kind. He’s selling it for $175,000 Australian (apparently the cost of his materials). The site dedicated to it goes into great detail, including CAD drawings and scads of pictures.
It’s an amazing beast, and looks extremely comfortable inside. The picture above shows the fold-out deck.
“WORT” stands for “Weird Off-Road Truck,” but it’s also known as the “wothahellizat.”
According to this page, this guy isn’t the only only to build custom motorhomes.