My Mk.3 came yesterday (Mk.5 too) and typical for me I had to see what the fit was like. I dropped other projects for a morning and I cleaned up the Mk.3 staring with the external parts. The clean up is painful in a few areas. The runners attach to the parts inside of attachment flanges. The intakes on the leading edge of the wing and the intake tube are a challenge. The order of assembly should help this along. The nose fit is rough on sides and front. I bucked the instructions and assembled the top and bottom wings and then attached these to the fuselage. There is too much play to get a good tape up. I will do the real deal and follow the top and bottom assembly method. The many “extra” rivets seem problematic. After all this I am still glad I bought both of the kits.