This is going to be another great build to watch. The 2 + 2 was based on the shorter wheel base Catalina body. Think of a GTO and a Catalina as kissing cousins. The 8 lug wheels in this kit represent a unique brake upgrade that Pontiac offered until they went to disk brakes. The center section is the brake drums that was an aluminum alloy that had an iron brake drum inside. Beyond looking very nice this also added in brake cooling. The raised fins were usually a machined surface and the area in between was a little rougher as cast finish. The outer wheel was painted a silver color and the trim rigs made it look like a chromed wheel. Converting to a convertible would be little more than chopping off the top and the boot, that's what we call the material that covers the folded top, can be found in the AMT '65 Impala convertible kit. Just have to find one. Knowing that you like to stay close to an OEM look the white interior would look good on a convertible. They would have had the dash board and carpet as well as the very low portion of the door carpet all the same color. The seats and most of the side panels would be white. These could be black or many other colors were offered.