Tracker: the answer there is, really, 'any'. I leave it to your aesthetic sense. The more high-res the better, is really the only condition.
GrauGeist: I am well aware of these conditions. The Bundesarchiv was my next stop. The US archives are just as prohibitively expensive as the Canadian, thus far, but I'll keep trying.
Nuuumannn: They specifically handed me the size, rather than the pixels. I'll go through their guides again, but the emphasis was on the size thus far.
As for the text, I doubt there will be particularly much, to my chagrin. I'd prefer to write at vast lengths on most of these aircraft. The text total stands at 80,000 words at present. And as I mentioned in my PM back, thank you very much - that's a huge start for me. The aviation community has never let me down, not in all the years I've dealt with it.
vikingBerserker: I'll give that site a try, and the publication date isn't for a while yet, so I can definitely wait a little. Thank you for letting me know!
Thank you all, actually, before I forget!