I would like to install knee braces in my kayak. I have the Minicel foam blanks,Ihave the instructions from CLC,but I'm some what unclear on the whole concept.The foam is in a wedge shape,quite a bit of that wedge will need to be cut off the narrow end,and you shape the thick end.Were does the half round molding go, inside of the cockpit at the top of the foam. On the blanks which surface is the top?