We have the computer mark the balance point and the lines for hinging the elevator and rudderon. With a computer, adding fancy graphics is easy, and today's inexpensive ink-jet printers make it possible to do it all at home. Assuming that you will choose cardboard, the best way to put a WARP 9 together is with a glue gun. Hot glue dries quickly, is easy to use and very tough, and its flexibility matches that of cardboard. Typically, CA does not work well on cardboard, and most epoxies are too rigid.
White glue is an acceptable, though slower drying, alternative.
A steel straightedge and a sharp blade make quick work of the outline. A scroll saw is a good alternative. Cut out the keel, with the flutes perpendicular to the wing, i.e., running up and down, not along the length of the keel. If you make your own planform for a WARP 9, the best way to find the proper balance point is to make a model of your design using stiff paper, balsa, or thin sheets of foam plastic. I use sheet foam from supermarket food trays.