For the majority of designs, we could just have, as example, RAF type B Roundels, USAAF markings with Red surround, standard USAF, Russian post war, and the various type faces such as Amarillo and RAF type etc. . They would be easy to find. Then an offshoot with non standard dimensions and fonts. Another section covering markings for a complete aircraft, maybe matched to a certain kit, and this could include canopy masks.