RE: Goose's H9 F4U Corsair ARF bash
Put the centre section on the fuselage and the problem is obvious.
I drew lines where the fuselage meets the wing section and made a little jig to hold my pen to mark underneath.
Both sides of the centre section and each wing end all had different angles by upto a degree or two, so I averaged them and setup my scroll saw.
So with pucker factor set to 9, off I went and cut the end off in a single pass.