With the pre punched kits, Jigs are not really needed for the 7 8 or 9's tails. With the 3 and 4's a jig is mandatory to get them straight however. When you get to the wings and start on the flaps and ailerons as well as the fuel tanks you will need to build a set of cradles but I dont recall using any Jigs to get to the stage I am at.
My 2 cents
-david
