How does one prototype a physical product?
cmos: I noticed the other day that www.sparkfun.com does custom 3D design and prototype, though this probably isn't the cheapest option as you'll be paying them to make the design:
http://www.sparkfun.com/commerce/static.php?name=custom_encl...There are lots of premade 'enclosures' that you could hack apart to get what you want as well:
http://www.boxenclosures.com/category/category.htmlHowever, I would recommend something like the online services mentioned here that send you prototypes.  Don't be intimidated.. just go through the tutorials and you'll be surprised at how easy it is.