Could you could take design ideas from the F-15 cockpit and use them without being skeuomorphic? Would you end up with a UI of checkboxes and radio buttons? Or was the whole goal to make something that looks like physical cockpit control?
I think some aspects, like toggle controls, are not very common today. Some people might have no idea what they are.
The fun part in developing for myself is I don't have to care what "some people" don't know. :)
That said, I believe my toggles have a couple benefits: they're labeled on both sides, so it's more clear what the options are. And the change is immediately visible, again making the functionality more obvious. The "modern" toggle where a circle can be on either end of an elongated cylinder and a string of text is somewhere across the screen in a step down from that, IMO.
I think some aspects, like toggle controls, are not very common today. Some people might have no idea what they are.