Lester,
I would not recommend wings if you are trying to race within the F16 rules because the wings would need to be calculated in the max beam requirement. Buy making you boat narrower to allow for wings you will move the leeward bow closer to the mast leaving you with less righting moment against the force of the sails.
Plus, when the wind is strong enough to be out on the wings you could also trap or fly a hull well above the water.
If you do decide you don’t want to be within the f16 box rule for racing you have some options. If the purpose of the wings are for performance you could design a Euro-type wings, that have less windage, but get your trapped weight out further.
See:
http://www.hobiecat.com/media/pdf/euro_wings.pdf#search='hobie%20euro%20wings'Might make a good backrest as well.
I could be wrong, but I think that the Hobe style wings are a safety issue as they make righting the boat harder.
Matt