This idea with the replicas of "The Red Baron" was the first which came into my mind, too! Although I doubt the producers of the film will be helpfull... it would be something like beaten by their own weapons
I also guess CGI isnt really the Problem - its the way how it was used. Yesterday there was Jurassic Park I & II on TV. In part I the Effects were added very tasteful & in a 'realistic' way. Part II wanted just to showed off how much better the CGI was compared to part I - but there were no excitement or plausibility anymore...
So I think its a difficult task to awoid 'showing off' but it will worth the efforts.
The Red Baron looked more like a PS3 game than an aviation movie (although with far too much dialoughe scenes for a game
).