The TAS enterprise seems to have more chunky nacelles and a longer shuttlebay:
http://www.hobbytalk.com/bbs1/showpost.php?p=4460081&postcount=8
See if you can do some orthos...
The TAS Enterprise was not made on a drafting board, but an artists easel. So some artistic license has to given. However, some of the animation of the ship maneuvering was roto-scoped from TOS.
Understood of course--still, their inaccurate take has its own charm.