Steve
YOu might be interested in what one of our members did, He inverted his engine and closed in the top and front of the engine compatment w balsa. So has the look of a cowled in engine. Slightly rounded / filled in the sides also. If you look up the thread on 4* modificattions it shows you how they did it to a 4* which is about the same as far as the cheeks and engine compartment go.
(Duh Dennis I guess that is a cowled in engine) Ok ok so is not in fiberglass.
I am going to recover my Hog Bipe with fabric and paint this winter and I think ill make this modification. I don't think the 70 will be enough power, you will be dissappointed if you go with that. I have a 91surpass in mine.
The DiBo