Finally got around to printing and mounting these updated Space Crusade boards that I found here:
http://free-dungeon-tiles-to-print.blogspot.be/search/label/Sci-FiThe site is in French, so I'm not sure who to credit for the design, but they are certainly attractive!
The boards were printed on linen cover stock, mounted to mat board, and sprayed with a few coats of clear acrylic sealer.
The walls are printouts of the original walls. They were printed on linen cover stock, folded over to give them double thickness, sprayed with acrylic sealer, and assembled into one piece with scotch tape.