I would try and keep the rules for the use of windsurfing sails as all encompassing as possible. So as not to exclude many of the cheap rigs available, a quick look on the uk ebay site showed over 30 rigs of all sizes and budgets. The system I use on my biplane multi with windsurfing rigs is very similar to iceflyer, with a submast and it works well with good gust response. As mentioned the camber inducers sometimes need some help in light winds but its no big deal.
