I've done that but just have the destroyed tanks img. Can't find the tanks in a perfect state to edit!

There is any way to pick up the gun of the fallen comrades? My soldier with the panzerschreck died and the churchill was coming so I tried to pick up the gun from the fallen soldier, but I couldn't do it. There is any way to do so?

I want to create a simple mod, but I need help. I want to edit the tanks of the game to put the tank commander in the top of the tank like the picture in the attachment, I don't if it is possible but if is can someone help me?