Vehicle Models Tips?

Hey there, i was thinking, i am a person that always needs to do something productive in the background and i recently got my self into blender, and not gonna lie i kinda quickly learned alot of stuff and managed to get some cool models from that, so after a while i've decided to try make something like a real life model of a vehicle possibly for a PR later on.

Since you wanna make something realistic as possible to the original real life model, i suppose you guys are gonna look for some kind of blue prints of the actual vehicle or do you just look at pictures of the vehicle and you slowly go from that ?

Also is there a possibility to extract the in game PR models ? so i could get a reference? because so far i made like a fictionary vehicles, this one bellow was meant for a game called Foxhole like a suggestion and i made a little cute model of a tank vehicle which took me like a week since i installed blender for a first time so i am pretty happy with that :lol:.

Since Foxhole also is taking inspiration from real WW2 vehicles i also put something together so you can see couple of vehicles inside this model.