People will build anything. I saw a Rollei full line "family photo" and spied what I thought was this, and Google confirms it was a thing. Dead Link Removed
Again, I couldn't imagine sealing that thing up with only 12 exposures, I suppose 70mm might have been an option?
I saw a Rolleimarin for sale once at a flea market in Louisiana. They guy didn't want much for it, and didn't really know what it was. But it was incomplete and I didn't have a Rollei to put in it, so I passed.
It was impressive though.