I really hope VivaGT-Robbo has been able to save this car. It may well be a sole survivor. Another example of a Viva GT in Elkhart yellow exists in Dave Wheatley's immaculate Mk 1 1/2, VXE710G, but that car is a transitional example with many Mk II features, eg, centre console ignition and switchgear, no matt black bonnet, rostyles, broad stripes etc. The Mk II was never actually sold in Elkhart yellow, at least not in U.K. spec.
Only Mk 1 U.K. spec Viva GTs were offered in Elkhart yellow along withe the more common Le Mans blue and Monaco white. The original 1968 Mk 1 sales brochures feature an Elkhart yellow car. Other enthusiasts may hopefully correct me, but I've never come across another surviving example of an Elkhart yellow Mk 1 Viva GT, at least not one that hasn't undergone a colour change years ago.
So if VivaGT-Robbo were to restore this car to it's original spec and colour, it could be a unique example. I really hope he is managing to progress with this car, and hasn't scrapped it or broken it for spares.