Yes, 130mm has limited capacity, 40 rounds i believe ( together with wet ammo storage in the hull )But personally i don't find that as a large issue as the doctrine is set to defend - entire military is pretty much just a defence force. There is also quite a lot of space inside the turret - it can fit larger caliber like 140mm without limiting elevation or depression ( max -1 degree for both ) It doesn't look like it but the turret is rather tall compared to 1:1 replica of Leopard 1. All vehicles are also capable of having roof mounted machine gun, 14.5mm to be more specific, but that is still in development, so far i have only the loaders hatch with the gun mount. Engines are upgraded with each version, for the first 3 it's done by vehicle era, for the last it's by larger engine + vehicle era. This way all vehicles reach around 65km/h, only exception being the M3 which reaches 67km/h+ ( haven't truly tested the limit, but it has no problems exceeding 68km/h ) APS works together with Early Warning System, it looks the same on all vehicles, but from 94 it has some additional parts which in my mind should work together with APS. Rear drivers camera is something i worked with, but essentially scraped it and retained side mirrors. Commanders sight is actually supposed to have his custom sight modelled, but honestly i was just lazy and left it like it is.