Hi Gary, what ever you do for plans get a BIG supply of appropriately sized latex gloves,possibly some Tyvek sleeves and sit down with every kid and go over safety rules for using the stuff (epoxy). If some kids get sensitized at this age it would cut out a lot of epoxy construction later on in life. Kids come in a wide range of sizes so it is a good idea to get a kayak that fits. In other words a design that fits a 200 lb adult but is 13ft long is no good for a 90 lb youth. Misc. other thoughts, kids will be very stable in most kayaks,so don't worry about a "tippy kayak" the most common problem is too much kayak. It's when folks get top heavy and tall that tippy gets to be a problem.-lee