Mark,
they are pretty much all over the range, but most have had some multihull experience at some stage. Probably the dominant theme is that the kids are not interested in sailing opti's, splash's or lasers. Most are involved in clubs and about 50% of them have some experience either in building or rebuilding boats at sometime in the past. The other theme that has emerged is that probably about 80% are being done as Father/Son/Daughter projects where they build it together.

Cheers
RG