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Many thanks, this is quite helpful. I noticed the notch on the Corsair fit as well, but in that case the flaps behind the cowling (i.e. on the back side of the engine part, facing the fusilage) don't mate well without some sanding. (Unlike the hellcat, there's no QB firewall involved.) So what you said reinforces what I thought, which is that a bit of sanding down the back of the engine is probably all that's needed - the front fits fine and gives (as best I can tell based on the kit parts) the correct height. One last question, if you don't mind: was it just a simple drill job to