When I built my Core Sound 15 this summer, a neighbor girl made clear her love of sailing (previous summer camp experiences.) In September, I invited her and her family to join my wife and me in the third sailing of my just completed CS15.   When I later asked whether she might be interested in building her own sailboat this year, after much thought she and her parents settled on ordering a full Spindrift 10 kit. The order was received today by B&B Yachts.   The