Create your custom cake mold by following the instructable for custom cake molds
. I tried to make the giant Twinkies mold dimensions based on scaling up the recommended (13 x 9 x 2) inch pan to use. The mold is (13 x 4.5 x 4) inches to accomodate the same volume. The sides can be higher to prevent any spillover when the cake rises. Cover the cardboard form with at least 3 layers of heavy-duty aluminum foil. Shape, form and remove from the master mold.
No, I do not think IKEA really sells the RACK TWINKEN mold. I just wrote the logo on. By the way, does anyone know if the names of their products are real Swedish words?