Hmmm... might be worth checking out some of the DIY steampunk sites - seen various ones with guides to building chunky metal goggles. They're probably going too far the other way and too chunky and strappy, but you might be able to get enough ideas to design your own glasses... particularly if you can get hold of something like this and use the lenses.
http://www.singularphotography.com/Goggles/
http://www.streettech.com/modules.php?o ... =0&thold=0
Would probably be quite a project, but the more you could cannibalise from other old sunglasses the better...