Thanks eatSleepWoof. I appreciate the infoThat flatbed version was a one-off, and is owned by insta-famouns Jon Burtt: https://www.instagram.com/jonburtt/
The folks that made that camper have started a company called "Vagabond Outdoors," and have a non-flatbed, slide-in "Drifter Camper" available for purchase. And it's a damn nice one, too.
There weren't very many options for years and years until recently.It's interesting to me how may people seem to have bought a Flippac and then moved on from it.