Remember we have a good deal of wiggle room in the actual sizes. I have to dig up my post, but a small French light tank would be visibly smaller than a medium or heavy tank.
Here is my post - notice the progression in sizes. Trust me, the difference would be easily visible to the eye. Plus, we are not going to confuse a Tiger with a Panzer II
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Did some measuring of current Axis & Allies tank sizes. No matter the real-world relationship between tank size, the current convention is to stick to a given range, and depending on a tank’s relative size put it either at the top of the range (Panther) or bottom of the range (Type 95), etc.
Here are the measurements: (Length is point to point on longest part of tank / Width is track width)
UK Matilda
20mm L / 9mm W
US Sherman
22mm L / 8mm W
GER Panther
22mm L / 9.5mm W
RUS T-34
21.5mm L / 9.5mm W
JAP T95
19.5mm L / 8.5mm W
ITA M41
20mm L / 9.5mm W
Obviously the Panther is the largest (and widest) tank, and the T-95 is the smallest. Here are my proposed measurements for the French lineup:
Hotchkiss H35
17mm L / 7.5mm W
SOMUA S35
19.5mm / 8.5mm W
Char B1-bis
21.5mm L / 9.5mm W