I've been trying to think of what units to include and which to leave out; I think for tanks there needs to be at least 4 different progressions (not counting the obsolete WWI tanks available at the start of the scenario).
armour I;
Represents the first real experiments in tank design by the european and american nations, they have either weak armour (german), badly placed guns (british and french), poor reliability & bad design (french & russian) or are just too slow (british).
When one fault is fixed with a re-design it exposes another fault, so that it requires many different designs to aquire a balanced tank force (the british at this time had a stupid amount of hugely different designs all of them showing one of the flaws above, this meant that finding spare parts and repairs would be difficult because of the high number of greatly different designs).
Examples of armour I are the french CharB1, the german panzer III, british matilda II, the american stuart or grant/lee tanks, the italian M13 and the Russian T26 and BT5s.
armour II;
Greatly improved over the first designs these tanks usualy have no major flaws. However they usualy require some refinement to realy reach their true potential.
Also at this time many Nations will have the option to build heavy Armour IIs which require much more resources but are more powerfull.
STD Armor IIs include; The russian T34, the german panther, the american sherman and british Churchill (both somewhat weaker than the russian and german models).
Heavy Armour IIs include the American Pershing, German king tiger and Russian KV1 and JS2.
Armour III;
The early cold war designs, many of which are still used today by some smaller countries. They combine the power of heavy Armour II with the speed and low cost of STD Armour II.
Those countries with leanings toward the west will have M60s and those alighned with the east T55s.
Armour IV;
True modern armour, national variants include the Challenger 2 of britain, the Abrams M1 of America, the Leopard II of Germany and the T90 of Russia and her allies.
Most of the tanks will therefore have similar stats but differnt graphics will be included for flavour and when a particular aspect of a vehicle needs to be shown, like the toughness of the Matilda or the poor design of the M13 and CharB1 compared to the tanks of other nations at the time.
Other vehicles will be introduced with similar techs so that Armour I gives america the Grant/lee and also the half track and Assault gun/mobile artillery. And Armour II gives them the sherman and Pershing and also the tank killer. I'm going to make an APC to be introduced with Armour III and true modern mech infantry will become available with Armour IV.
So although there will be plenty of flavour, there will mainly be only the following vehicles
-Outdated WWI armour
-Mobile infantry (in trucks)
-Armour I
-half track
-Assault gun
-STD Armour II
-HVY Armour II
-Tank killer
-Armour III
-APC
-Mech artillery
-Armour IV
-Mech Infantry
-Missile artillery
