- more G11
Leopard 140 is not just merely a prototype, but is not even half a prototype. The only thing they did (by the way, it was Switzerland, not Germany) was put a 140mm cannon in a standard Leo 2A4 turret on a standard Leo 2A4 hull. They did not design new ammo bins, did not change the turret to fit the ammo, and did not do the necessary modifications to accommodate the gun other than place a few weights in the back and sides of the turret to keep the gun from cracking the mantlet.
So by this logic, Switzerland should be added to the game with the Leo 2-140, USA should get the CATTB, USSR should get any tank armed with a 152mm gun (despite these not being functional tanks), and Israel should get a 140mm on Merkava 4 as well because the 140mm project was a joint IMI-RUAG development.
Germany also build its own 140mm canon. U might recognize that the shape of the german 140 mm canon is diffrent from the swiss RUAG canon. Especially regarding the shape of the muzzlebreak.
the Leopard 2 140mm canon hzad the prototype name NKPz 140
Also there were other great prototypes like the Leopard1A6 and Leopard VT 2. Basically a Tankdestroyer armed with 2x 120mm cannons
There are plenty of unique equipemtn and less unique equipment even for the tiniest of the wargame nations.