Script doesn't mean a whole lot folks. The script doesn't detail what the ship should look like, it just says "Starship Enterprise". The script doesn't detail what the bridge should look like, other than maybe "a circular command center", it just says bridge.
So guess what, Orci and Kurtzman probably did write a script that did adhere to canon, with any changes "having an in-canon explanation".
I have seen the darkness in my soul and shine brighter for it.