Try the Johnson Space Center, they have a full size Skylab there, if they have a website, they may have pics of it up. If you're near Houston, Go and take the tour, not only is it amazing, and fun, there are tons of things to get reference pics of. You can sit in on mission control as well sometimes, and they have an imax theater that shows space footage, it's amazing. There is also a rocketpark where they have 4 different rockets laying on the ground, you can walk all around them and take photos.
Here are some interior photos...
http://spaceflight.nasa.gov/gallery/search.cgi
http://nssdc.gsfc.nasa.gov/image/spacecraft/skylab.jpg
http://static.howstuffworks.com/gif/space-station-skylab-orbit.jpg
http://aesp.nasa.okstate.edu/fieldguide/pages/skylab/skylabhu2.html
http://www.bnsc.gov.uk/assets/skylab.jpg
Hope that helps some.
madda
Madda
Trifles make perfection, but perfection is no trifle. -- Leonardo Da Vinci
Tact is for those who lack the wit for sarcasm.--maddafinga