I have been creating my own mods by changing the files in the main game and after playing for 30 minutes, the mods will disappear out of the parts selection or will not run. (I have just been changing engines to have higher revs and more power) 1. How should I get the mods to not disappear? 2. How should I package the mods to add them to my game more correctly? Assuming I were modding an engine, would I just have that engine's specs or all the engine specs?