Are there existing dimensional specs out there for the various boards?
I'm planning a project which will involve laser-cutting some acrylic board enclosures, and I figured I'd see if there are existing dimensioned specs before I go and produce some myself. In particular I'm planning an enclosure for a Arduino Nano which would have holes cut for the usb port and individual holes for the pins.
I'd suggest you go with the official EAGLE files - there are a number of dimensioned files around but the EAGLE files are what the boards are made using so they are as good as you can get.