I have been making aircraft models for over 30 years. At first I worked at Minifig scale but after making 50 models I moved up to 1:18 scale which fitted the Lego Technic humanoids. This scale is much more satisfying as you can show the small differences between models. For example the difference between a Stuka model B and a model D. This is not possible at Minifig scale. My main interest is in World War 1 aircraft and of the 150 plus models I have made over a hindred are WW1. In general WW1 types are easier to represent accurately as they are more "square built " than later planes.