WoW! You have your work cut out for sure! I thought I had a lot of kits waiting to see the light of day!
With mine, the NEWEST kits in my 45-55 kit stash were made in the late 1970s. Except for my 3 M1A1 models I plan to do. The operative word is PLAN. I actually started assembling the tracks for one of the tanks as well as an F6F Hellcat. Problem is, it’s no more fun putting the tracks together on the M1 than it was working on the tracks of my REAL M1A1(s) when I was still in Uncle Sam’s misguided children’s club. It IS somewhat lighter, however, since one track block (section) weighs 88 pounds! (about 50 kilos, with 87 track blocks on one side & 88 on the other)