I have not ordered Waco drawings, but I have ordered microfilm for the Vough F4U Corsair. I ordered 18 rolls of microfilm, and it took a couple of months for them to fill the order. What I found is that every drawing has distortions. The original blueprints were of course on paper, and were already old and somewhat deteriated. These were stacked, then photographed, then put on microfilm, then reproduced at least once before I got a copy. As a result, the X and Y scales are not the same, most straight lines are now wavey, contrast can be so bad as to make some drawings completely unreadable, lenghts can be stretched and compressed in areas, and there can be other distortions too. Still, you may be able to get drawings that can be very helpful, and if you are really interested in accurate drawings, I doubt that better can be found. The best drawings will have dimensions on them so you can re-create them accurately in CAD. Also note that you have to sign a use agreement that prevents you from copying and/or redistribution, or for commercial use.