I don’t know if this is for 1.35 or 1.5, but anyway, modding parts is not as simple as it is modding planets (in 1.5, because 1.35 can’t even mod the planets), because the parts are coded deeply in the code of the game. Not to mention that any mod for 1.5 is forbidden by the creator and owner of the game (Stef Morojna), and therefore severely punished in any community. 1.35 modding is perfectly legal.