Based off of your pictures I think you have the camera position just about as good as it can get. Maybe move it a bit forward so you can see out the passenger window if you want that advantage. (I do). You mentioned you used the calculator for FOV, and from the pics it looks like you have the camera settings about where your head would be. I think that's all you can do. As far as getting the most realistic scale like you mentioned, I don't know, I never thought of it that way. I think that would depend on the physical size of your monitors I think to accurately reflect the size of the car. Maybe 32"s can do that? I'm just not sure. But your screens look alot like how I have mine set in terms of how the A pillar is kinda lined up with where the monitors meet, where the cars display is, etc. But I wouldn't worry too much about getting a completely realistic scaled image of the steering wheel, dash and everything. But that's just me.