Okay, I'm a total beginner with Fallout modding. I've been looking into simply changing the inventory picture of an item and making some progress. The thing I'd like to know right now is what are the maximum possible dimensions for such a picture?
Well, I managed to finish what I set out to do. Looks like about 55 pixels is the maximum height of the item pictures in the game. Much more that that and you'd overflow the 'in-hand' panel.