MAKE BACKUPS! Trust me on this. Drives fail and take all yer stuff with 'em. When you get the files, the first thing you do is copy them to *another* drive, then burn some CDs or DVDs.
Since the 2707-300 are bluelines I think I'll just clean them up but then these will also be converted to vector and traced with weighted pen brush, gives a nice result similar to this XB-70 detail:
Meh. That would make the drawings "better." And from the standpoint of aesthetics, IMO, "better" is "bleah." You just can't beat old-school hand-drawn blueprints. Variable line weights, shaky lines, hand-scribbled text and downright errors. If you want to produce an *actual* blueprint from your scans, what you'd want to do is get good, clean grayscale scans, with basically black lines on white background, and then print it out onto something like translucent mylar. This can then be used to make old-fashioned cyanotype prints, if you can find or make paper of the required size (three meters long? Don't bet on it).
I am currently tinkering with some commercially available 8X10 cyanotype paper; four experiments so far, first two were clear failures, 3 & 4 turned out well, but with minor issues. 8X10 is too small for much of anything apart from experimentation.
For pure utility, black lines on a black background is the best. For "art," white lines on a blue background just can't be beat.