Cetrified aircraft get certified procsss you describe. Hokebuilts do pretty much whatever they want. Want fibreglass tail surfaces?, go ahead. 3layer is not often done because it's heavier and more expensive. Possibly the two double plus ungood major bugaboos in homebuilt planes
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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