The T-craft used a 230XX airfoil (XX refers to the thickness in percent). This airfoil has been the workhorse in the industry almost forever. You would find it on the DC-3, most precip Beeches, Van's RV-3, 4, and 6 homebuilts and many others. It will fly inverted fine, and be more scale doing it. Since a model is so light, you might want to lower the incidence, because the full scale work the incidence based on the wing loading and cruise speed.