Need precise dimensions of aluminium keyboard

I was wondering if someone could please provide *exact* dimensions (to a fraction of an inch) of the newish iMac aluminium keyboard, such that I can print out an image, cut out the holes for the keys, and lay the printout over the keyboard and have everything line up. (No, I don't actually own one of these keyboards!)

A CAD model/image would be perfect! Thanks!

I have a goodish JPG image already, that is good for determining the *relative* sizes of the keys, but I don't have any actual measurements to serve as a reference.

A measurement of one of the key's dimensions might suffice. (Not sure yet.)

-Mike

<s>Nevermind. I found a Google SketchUp model online.</s>

[edit]
The model has several errors. I guess I *will* need help after all.

Err ok, if you must! You could go to a store with a tape measure but they may get a bit narked if you start sizing up the goods!

Width (sizes in mm) 430 Depth 114
Square keys 15 x 15
If you need the others I guess I can oblige, lets see how you go though.

So the sizes are definitely supposed to be in mm and not inches? Also, the keys are perfectly square? The photograph I downloaded shows the keys being a tiny bit wider than tall, but I wasn't sure if this was due to distortion in the photograph itself.

[edit]
Here's the image I've been using, BTW:

Google Image Result for http://ltacc.com/syssite/home/shop/1/pictures/newsimg/1240000368.jpg