Hello.  In two weeks, I need to look something like this guy: http://dsc.discovery.com/fansites/mythbusters/meet/gallery/mythbusters-adam-savage-bio-2-324x205.jpg

I've already got someone doing Jamie Hyneman.  The only problematic bit for me is the glasses.  See, I already wear glasses, and my frames aren't that thick.  So, in maximizing authenticity, I'd like to do a DIY-conversion for my glasses to make them look like Adam Savage's hipster glasses. 

Here's my working hypothesis.  I get some kind of thick, lightweight, cut-able material and cut it into two parts, with a groove lining the inside.  Then I glue the two halves together, fitting around the frames of my current glasses.

I'm thinking my best option for a material is thick posterboard - the stuff that's sort of foamy in the middle, with card paper on either side.  The foamy bit would make it easy to carve a groove and fit it around my glasses.

Here are my current blueprints: <a href="http://tinypic.com?ref=3093kg2" target="_blank"><img src="http://i50.tinypic.com/3093kg2.jpg" border="0" alt="Image and video hosting by TinyPic"></a>

Would love to fish for a few more ideas, though, before I dive headlong into this.  Are there any other materials that might do me better, or a better method altogether?  Input of any sort is appreciated!