Thanks for the snap. Looks similar to the Scottorn 6 wheeler in my 'Range Rover The First Generation' book. Whole chapter on custom RRCs, including some very dubious reworkings of the grill and headlights. How about 8 square lamps and Rolls Royce style grill, anyone?
I remember reading an article about that one a few years ago. It actually runs on rail tracks - there are a matching pair of small wheels at the back and they swing round and under the car. I think it also had a matching trailer and was used for some sort of track maintenance.