To all of you who responded to my question about the old trainer I want to thank you for your input. I believe I have solved the mystery. The current Carl Goldberg Products inventory includes "The 63 Eagle II". Except for the ailerons everything else is exactly like my airplane ; 63" wingspan, cut-out windows, flat stab & rudder with no airfoil, plastic pre-formed wing tips, and overall length. I seem to recall that back in 1980 when I purchased the kit Carl Goldberg had a big trainer named "Eagle". I think that Goldberg's MK series and the Eagle II series are more recent designations. Thanks again for all the input.