Oh yeah...this is Al Kossows labor of love, and a fantastic resource. If you've got some old manual for some obscure machine in a box in the basement, consider seeing if Al could use it. Reminds me I need to send him the Interdata 8/32 instruction set manual that Dennis Ritchie gave me.
One day Al will be remembered like the Irish monks who laboriously copied old Greek and Roman texts to preserve them for future generations.
I have so far found blueprints associated with the PDP-1 [1] in the documents portion, but mostly image files in the software section.
[0] = http://bitsavers.trailing-edge.com/ [1] = http://bitsavers.trailing-edge.com/pdf/dec/pdp1/blueprints/