I have my own idea what I'm going to use for joints, and internal mechanics but for an outside body and source material it is a bit tougher. I know with plastic it would be easier to "weld" the joints and endoskeleton to the outside panels. But, with die cast it would be more durable and rugged once painted. That is a plus as I was considering once I did a few of my own customs to try one for someone else or to display it at work. I have a couple of die-cast cars already available, and most models I find are die-cast. I can find some plastic models, but I don't want to sacrifice anything in vehicle selection. One question I have with die-cast is how easy is it to join plastic parts to it? I ask because I have my latest find ready to be stripped down, retooled a bit (it is a CHEVY after all) repainted and assembled as a new Alternator style figure.