At least there are options available. Not bad for uncommon kits that are over 30 years old. I bought and built that Academy Jagdpanther around 1988 when I found it in an out of the way hobby shop in downtown Mannheim, Germany. It was old store stock back then, and that was 23 yrs ago.
Today you can at least find some PE, barrels, tracks, etc.
I did a quick search on eBay, most of the ones designated RC or motorized (mine was battery powered and just went forward and backward like Tamiya kits of old) came with the vinyl snap together links. Today, I know my built JP is probably worth more for the indy track links than as a built kit.