This is a file package that allows for increased accuracy for the SSN571 Nautilus package: 
 
The fore and aft profile angles have been corrected to reflect the actual sub
The top has been revised, adding more curvature to reflect the real sub.
The height of the sail was changed to reflect the actual dimensions of the sub.
The flag pole location was removed from the top back of the sail, and moved to the lower stern portion of  the sail, per the actual location.
The hand rail was revised to reflect how it actually was, and made integral to the model, so gluing together is not required making it much stronger.
The door location was moved, as well as the size altered to reflect the actual sub.
The rear fins were changed in size and location to reflect their actual position.