Here's some resources:
The NASA photo server at dryden has a whole contact sheet of images of their white version of the ER-2. Maybe some details show up better in those shots.
http://www.dfrc.nasa.gov/gallery/Pho...TML/index.html
Not exactly a design resource, this web page sells blackbird T-shirts, including one for the U-2. The U-2 print actually glows under black light. Very cool scene. I'm wearing mine for casual day.
http://www.airbornflightware.com/u2.html
I have some 3-view/ detail view stuff at home that I copied out of books. I'd have to scan it, not sure about copyright infringement either.