The most interesting thing we see here is the fact that the iPhone 4 and 4S are thicker than the iPhone 5 by the thickness of the back glass. So here is an easy way to imagine the thickness of the iPhone 5: remove the glass backplate from your iPhone 4/4S and there you go! That's the approximate thickness of the iPhone 5.
The site also notes that the fully assembled unit has a good feel.
"Having the mostly assembled unit in our hands feels nice. It fits in the pocket just fine and I can see myself getting used to the longer screen rather quickly."
Take a look at the photos below or hit the link for more.