Paul, that is one substantial chassis, I always thought the Mini De Joux, was just the Mini floorpan, now realise had the front bulkhead
and part of the inner guards, as well ar the rear bulkhead the back seat support.
A friend of mine had a De Joux, back in 1978, which had a lift up back window, it was a deep green. I was envious as only had 850 cc standard Minis by then, although they were slightly modified