sounds like you've covered it all, if the engine bay is nice and clean you'll be laughing. didnt really need to remove the subs and amps from the boot, as long as its all secured and the wiring is secured every 30cm you'd have been fine. as for the ride height, if its legal then its legal. there shouldnt be a problem with that. dont know about the headlights, personally you can only try ya luck i spose