They could have done the whole thing so much more accurately had they got the Old Rhienbeck folks to provide the aircraft and do the flying. There are accurate replicas out there that can be reasonably flown to 3-4G that could be flown by their normal pilots in a way that is safe and much more representative of the real thing.
I guess that would be much harder to put together though, when there is the option of a pair of cheap to insure ex-service pilots and two very replaceable 1930's lookalike planes. I personally don't give a damn what a Harrier pilot thinks of a Currie Wot.