That's very illuminating. I have read a lot of the archive stuff, but not much on Quixote -- I felt more distanced from it than the other works until finally seeing some of it, I guess.
If the '92 version was produced entirely without access to this cut Orson himself had almost completed, then, actually, it can't really be considered the same film at all. I'm encouraged by reading this, because even ignoring the obvious problems and ineptitude of the production, what it shows doesn't look very promising.
I have another question, now. One oft-repeated story is that Francisco Reiguera replaced Mischa Auer as Quixote at some point during the shootings due to the latter's death. I'd like to be clear on timelines. When was all this footage shot? Starting maybe in 1956, running through to 1969?
Francisco died in 1969, so no footage with Quixote could have been filmed after that date. But here's the thing. Mischa died in 1967, only two years earlier. I was under the impression that FR was the 'main' Quixote -- by far in more of the footage. (They actually look very similar under makeup, but FR has less hair, which is one immediately obvious difference.) A minor point, maybe, but it looks like me like Auer might have abandoned the production quite some time before his death. Perhaps the nature of the beast wasn't to his liking.
It's also interesting to note that Reiguera was almost 20 years older than Auer! And in very good shape by the looks of it, albeit painfully thin.
When was the last footage shot? Was anything more filmed after both Quixotes were gone?

