Eh I just eyeballed it,drew it, and cut it outta sintra, base glued it with some hot glue (gun 2 bucks, glue sticks 1 buck, Wal Mart, High Temp) then bondo the sides and edges, then sanded the kajesus outta it to make it smooth, the stock, and "gun" are all sintra made like this. 8 layers so far I think. weighs.. about 3 pounds, feels good and sturdy though.