Hi Robbie, I replaced my first plane's wing (30 years ago) with a foam wing from Wing Mfg. Third plane was a Sig Kougar, foam wing too.Most kits the airfoil are precut. The saddle are there to help in gluing down the balsa, plywood or cardboard skins after gluing these in place. Check out the classic pattern section, most of the builds have foam wings.

Jim