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These pics are from last week's Cowl install process. It didnt have much extra material, but it fits!
I found that I had to push the cowl as far forward as possible for the circumference of the back to be sufficient. I put the spinner inside the front "Ring" and worked from there. I also had to trim the metal at the bottom of the fuselage all the way up to the dzus plates.
Just a few rivets and filler and the cowl is done.
A longer extension will help on this as well. will supply.