reference is from marvel i believe it was from marvel.wikia.com. i am using the few pic of the plastic model of the page you posted from fantastic plastic.
bullet, if you found something on blueprints.com, let me know. if it is any better than what i got. - only problem is there is 5 versions of blackbird. 2 real: sr-71 blackbird, sr-71b blackbird and 3 x-men blackbird: xjet from each movie - but they are each called blackbird (no version number on them far as i know)
well actually 7 versions since the sf-71 has the sister plane yf-12 for each version.
here is what i deal with (as seen in the first screengrab). as you can see the blueprints are not correct - besides the fact that they are fuzzy. but that is as best as i could find after a looong time searching. so i said screw it, and started - gonna have to get details and modifications in from the few pics from the movie.
cheese, duckie (as you brits say)