You do realize I hope that if you have most of the dimensions you can loft it full size, it is after all a fairly short kayak, and then you'll have all the dimensions you'd ever need to build the boat. Sometimes doing things the old fashioned way is faster and often more accurate than doing it digitally.

You can cheaply get heavy rolls of paper for protecting floors from the big box home supply stores, Home Depot, Lowes etc. and they are ok to loft on for a project like this.

Bill H.