@Andrew0Red
lol at the superheavy cannon being BFG sized. I think this is a dramatic improvement to what it was before, you're no doubt putting a lot of effort into this.
For objective things.
The special modules don't seem to mention any of the limitations involved. Certain modules you can only have 1 of per chassis (radio, dozers, among others) while some limits are chassis specific, like moderns/amphibious not allowing extra turrets, lights only being allowed 1 and mediums only being allowed 2.
I might do a pass over to fix particular values like breakthrough per armour upgrade, speeds and costs and stuff from engines and armour types suspensions and such, not a big deal right now.
The flame tanks (and light tanks used as recon) do not offer any hardness.
For the subjective things.
I won't say that the way you have organized the guns is bad, just that I would do it differently. You seem to have noticed that certain guns/modules will put a hard limit on the classification of the vehicle as only a certain specific type. Things like, mounting the flame thrower means it will only be a flame tank and not anything else. Mounting AA means it will be an SPAA variant and nothing else. Rocket modules will make it SPG and nothing else. Certain other guns, like the howitzers and close support gun, will simply allow for the option of the vehicle to be classed as this or that, instead of forcing it. As such, I would have taken the armament category and split it between the 4 chassis options (tank, td, SPG, SPAA), and listed the guns that allowed or forced (and distinguish between the two) under each of those categories.
It might also be possible to integrate the possible turret sizing comments into the chassis details table.
Another thing is that most of the other wiki pages that I've seen, notably do not give any particular advise about what the player may want, and only gives specific information about values and mechanics. I've seen several small comments here and there that make suggestions of what a player might want to do, and these could perhaps be taken out and put into its own section or its own page.