The track has a lip that will slide up under the drip edge and I can fasten with a self-tapper/drilling. So, the main part of the U-Shaped channel will be on the face of the Fascia and Gable.One question - where are you mounting the track? On the face, or underneath?
While I have some Aluminum Trim Cutting experience, I am in no way an expert. So pretty much a Newb here. By any chance you have a mockup of a template that you could show so I know how to fabricate my mockup for cutting and bending. Thanks for any advice/help.If you have access to a 3d printer then a corner cap could be made.
Otherwise take some poster board and create a mock-up of the bullet track and create a cut pattern to make tabs off the gable face that will bend into the fascia face. (gable is the inverted V, fascia is the long horizontal side)