I designed a 1/4 scale Tomahawk back in 1978, for the Q35 engine. I had my model flying before Piper had any production airplanes built. Mine was built from three views supplied to me from Piper Engineering. It is exact scale except I widened the wing chord by 1.5 inches, as I just couldn't go that long thin wing. I used a NACA 2418 airfoil instead of the new airfoil that Piper had come up with. These are the plans that are sold by Reid's Quality Model Products. They can supply you with a fiberglass cowl if this is the size you are looking for. Remember that the plans are now 25 years old, so you may see things that need updating.

Here is a photo of my model and the first Piper Tomahawk to be delivered to our area. Twenty years after that delivery, my son Dick made his solo flight in that very same airplane, 9284T.