https://www.nextissue.com/magazines-issues-summaries/sunset-magazine-may-2015-edition/
If you get the magazine or go to the library, you can see the interior shot. Best teardrop ever. It has a translucent roof and that vertical seam at the back end of the driprail suggests—double doors!
This is now at the top of my priorities. The commercial product is $53K, or so I hear (I didn't read the text), so I wouldn't consider building one for re-sale because that wouldn't be right. But the one I build for myself, with a second hand Harbor Freight frame and VW bearing, wheels and hubcaps should be no more than $1500, plus the (modified Type III) hitch.
I have a lot of redwood benderboard so the side rails will be a laminated beam, and the sides will have some plan taper.