All the flcs that are included with a fan-made unit are complete in themselves, so you shouldn't have animations playing in the wrong directions. You are correct in that most units don't have the full compliment of flcs, often lacking fidget, fortify and fidget. In these situations, the civ3 game engine automatically plays the default animation. So there's no need to worry. Fan made units are always to a high standard, and will work correctly (unless it's you-know-who, CFC fans

).