It's a whip up :)

But I think the go pro could be the way forward :)

There is only two other shots in ESB that I am currently aware of that uses this particular angle of when Leia says "Star Destroyer" towards the end of the film. And the Space Slug Escape (this one is a little different) But I believe there are more in ROTJ escape out DS2 springs to mind at this angle but I don't think Star Wars uses this angle at all if my memory serves me correctly.

Just a quick extra thought but would it be possible to use a 3DS Max model and simply delete the windows if they are a hard shell and put a camera in there? Not sure what field of view the camera should be set at mind but perhaps a standard FOV would do..... The other option is simply measuring out some lengths on a accurate physical model and making a calculation. Unfortunately I have neither of these so I am making guesstimations.

I think it's a bit of fun trivia and not so sure it would work as an addition to the cockpits views but I am just more curious than anything else really.