As far as I know or as it appears to my eye, the original Tutor is basically a profile Gieseke Nobler. Take a look at the outlines, and compare the wing and see if you see the resemblance that I do.
I do believe that Charlie Baur or his son did work for TopFlite, just not sure which for sure but I believe it was Charlie. Several conversations with him over the years leaves me with a vague memory of that.
TopFlite (actually Great Planes) has a staff of in house designers and engineers, and some never get the credit for the planes or equipment that they design. Everything they do is the property of Great Planes. A freind of mine here in the St. Louis area worked for GP for a few years as one of their designers and gave me a little insight to the situation. My guess is that one of their in-house guys did some basic blow up of the out line of the original model, did a little bit of consulting with some one on the ins and outs of C/L stunt, then worked with the GP kt engineers and the ARF contractor in China on the construction.
That's my 2 cents worth.
Type at you later,
Dan McEntee