Mine is set to a middle age style, purely because of my love for female and knights, as you might have worked out already (hint hint Saber and Ferris Eris.) but I've introduce tons of different elements, such as build TDD-1 with medieval technology, which is none? Purely by character's intelligence and imagination, with other factors such as being able to manipulate elements including fire, water, light, shadow, lightning, wind...etc I manage to fit in a 22 century technology submarine into a middle age battle field and make full sense of it. Chemistry plays a bit part but I used the old name Alchemy instead. Is just I modify a tons of things, yet trying to be as precise and as accountable as I possibly could, there are in fact tons of Physics and science, eventually I'll introduce different things, genres, and try to be as accurate as possible by getting first hand experience. The thing that I love is drawing maps and eventually formulating battle tactics xD