Dont forget the Blade 16 Valtteri documented building on his Blog: http://www.rahkonen.fi/blog/

I definately recommend building in ply for the first couple of boats and not go for strip planking or composite. I dont know any available building plans for strip planking or composite beachcat construction, just ply. But the building method is not what is important, the motivation, available time, building shed and budget is whats most important.