If it can be done, If you have the time... possibly after the game is released.
If I'm a sucker for one plane in history, it has to be the SR71 BlackBird.
It wasn't a dogfighter, and wasn't even an interceptor... but...
I'd like to have an upgraded version of that plane available as a costly replacement for the usual XCom interceptor, providing you would want to purchase it. Say the SR71-A, upgraded to state of the art military equipment. It would have great speed, and better acceleration (perhaps or not, I'm no engineer, so this might not be true) than the regular interceptor.
It had max speed of ~3'500 km/h, and a range of 5'150 km.
I don't know by heart the X-COM stats for the interceptor, but this one (say priced at triple cost ?) could gap the bridge when you don't have much elerium, but still need to intercept UFOs, call it an X-COM fighter 2.0.
Note that I can't contribute in-game texture (really the hangar image, I think it's the only one ?) nor coding.
But here's a picture for those not familiar with the plane
Just a fantasy of mine =)