Interesting document - good find, I hadn't read that particular thread until now.
Those registered 97016 and 97017 were supposedly the U32 model, ie '411-112' model mogs, except they are not 2120 mm (83.4 inch) wheel base, but appear to be the 1720mm (67.7 inch) wheel base, which would make them actually model 411-110. (The 'U32' designation came in either wheelbase.) The chassis numbers tend to support the 411-112 model designation, but the images in the RAE document clearly scale as the shorter 67.7 inch WB. Curious! Wonder what the Unimog at Bandiana's chassis number is?
These two vehicles are a lot shorter than the one registered 107394, and have a different tray configuration. 107394 had an all-steel traybody with military style fittings, a soft canvas, properly fitted cab roof, no winch, and was a longer wheelbase: 2120mm or 83 inches. It was altogether a more substantial vehicle than those shown in the RAE documents. I don't have a definitive date for the trials of this vehicle as yet, so it may actually be in the 60s: will have to go looking.... Whatever it is, I would expect that it would pre-date the use of the plate on the No.1 Mk.1 Inter.
Mike C