RE: Great Planes Ultra Sport
As for the cowl i put fiberglass on the inside seams. and around the back edge. Then when i moonted it on the plane and had all my cutouts for the high and low speed needles. Then i used carbon fiber around all the mounting holes and the needle holes. Filled the seam with bondo and a small amount of squadron model putty. the putty you will find at the hobby shop by the plastic models works good. Then the secret weapon. Micro Fasteners sells stainless washers with a rubber backing. Maybe other companies have them also. I drilled the holes for the screws in the fuselage out to 1/8th of an inch. epoxied in some short pieces of nyrod. sanded them flush with the fuse. Now when you screw the cowl on the screws hold tight in the nyrod and the rubber washer hold tight agains the cowl so it does'nt vibrate. I am in the covering stage now with it so it probably won't get any test flights till April or so. But i imagine it should hold up allright.
Dennis