go with a known multihull loft.

Glaser Sails
Smyth Sails
North Sails NJ (Henry Bossett)
Ullman sails (Charlie Ogltree)
Saber sails
Calvert Sails
Elliot Pattison

Don't reinvent the wheel with a loft that does not make sails for rotating masts.

Cheers,
Eric