Yeah the top part of the armor is really thin, but i made a suggestion for a variant of this vehicle, the Vickers Medium Mk. IA. i’m not sure about the Mk. II’s, but the Mk. I’s all share the same chassis.
And while doing the research for it i’ve found that the lower part of the hull is actually decently protected, the chassis has a lot of armor, but the upper part of the hull it’s super thin, it’s where the armor is only 6,35mm to 8,5mm thick, although the frontal armor has decent angles, and the tank is sectioned into 3 compartments, 6.35mm plates separate those compartments (engine compartment and fuel tanks) from the crew this with the engine and radiator being on the front, while the fuel tank is on the back, would give you some artificial survivability in war thunder.
Sorry i got side tracked here, like i was saying, the chassis is pretty decent protected, the chassis has seven 0,25 in. thick plates attached to it on each side, and six on the floor, and these plates were made from homogeneous armor, for a pretty considerable total of 44,4mm of armor on the lower hull and 38.1mm on the floor, this armor paired with the engine compartment on the front could certainly, caught players off-guard if the didn’t aim their shots carefully.

Above, the lower hull of the Vickers Medium Mark I, where all this armor i mentioned is located, and bellow a illustration showing all the compartments that the tank is divided into. But again everything i just said, is for the Mk. I, Mk. IA and Mk. IA* i don’t know if it’s the same for the Mk. II’s.
It’s a cool vehicle series, and historically important, and it’s one i really like, it has the same gun as the Independent, so we know that the gun works pretty well at rank 1, and thanks to it’s unusual armor layout, i think it would be a interesting tank. Although like i said, this armor think is on the Mk. I’s (and Mk. I variants), i have no idea how it is on the other models.
