First of all, great job compiling that list of tanks!
-T-72 (for all variants use T-64 mesh if you decide to make one)
Why? The T-64 has some distinctive features. To me it seems that if the T-72 doesn`t get its own mesh(ideally it should) it would be better of using the mesh of T-80 than that of T-64(if it gets a proper new one).
Although I would like every tank to be represented with his own model, due to lack of "resources" (be it time, skilled people, or both) I suggeseted few models that could improve current variety (I tried to suggest one mesh for multiple units even though I'm aware some of them have quite distinctive features because Balthagor said they have very limited resources
). I focused on the pre '90s period so I figured, if T-64 is made than T-72 could use it's model (the differences are quite minimal although existant and distinctive; funny formulation, I know
) since ingame T-80 and T-90 models are partialy covered in reactive armour which T-72M and T-72M1 didn't have (only pre '90s variants present in the game). Ideally, eventually we would get someone to make/improve all the T-55, T-64, T-72, T-80 and T-90 meshes
...but that's just wishfull thinking
East Europe(connected to USSR section)
-TR-125 (use T-64 mesh if you decide to make one)
The point here being that TR-125 was based on the T-72 and should follow that in terms of the mesh used
The same reason I suggested it to use T-64 mesh that was also suggested for T-72