This is one of the others I saw from Heather. An early model rear bedroom, sold on eBay, from memory the sale was stopped early already way north of $20K.
But it would have taken much more than that to install an interior as it actually had nothing inside.
I remember being told a story that in the last 5-7 years, she had found 5 20ft for sale, had she had bought, polished and sold 3 (on eBay). I suspect the example on Fred's site (simply because of the similarity in the decals) is one of those, but then someone redid the interior and mechanicals.