Curious stuff ... first up, when compared to all the other GM coupes referenced in this article, only the HR Premier SS coupe and the Chevrolet Corvair Monza share a 'B' pillar and framed doors. However, in 1965, the second generation Corvair became pillarless. The HR coupe renderings of Alf Payze and David Veltman are dated from August 1963, so I'm reckoning by 1965 the concept of a pillared GM coupe was probably redundant ... second up, I'm curious about the timing of the concept, given that the first full-scale HD Holden prototype sedan was still being fettled in mid-1962 and the HR coupe renderings were generated the following year. It hardly makes any economic sense to seriously consider a body variation solely for the HR series when that series had a short production life from April 1966 to January 1968. As pointed out in Retro Autos' article, Holden certainly didn't have the convenience of exploring body donor items that Ford Australia was able to do with components from US production Ford Falcon and Mercury Comet vehicles. However, prior to releasing the 2-door hardtop in 1964, Ford in Australia had earlier created six examples of a metal-roofed 'Skyliner' convertible with the XL Falcon series, specifically in association with the Miss Australia Quest of 1962 ... the cars were actually converted utilities, with manual roof operation, the actual body modifications having been performed under Ford supervision by Bodycraft in Melbourne ... here are some historical images, including one build process image, and a shot of the proud 1962 titleholder, in Miss Tricia Reschke, with her personalised convertible ...