What kind of Tornado mast do you have? It makes a big difference. A tapered Marstrom would be best, I think
I do not think anyone has developed any new sails for the NACRA mast in years.
Ullman has some excellent 18 sq sails based on Tornado sails.
Ullman has lot of experience cutting sails for an al Tornado mast. You could expect a very good match between mast and sail.
A prebent Tornado mast is a lot more stable than the NACRA mast.
Slightly used Tornado mains are cheap if you know were to look and you might be able to use them as fun sails or light air sails.
Charlies email is:
cogletree@ullmansails.com