Prior to the transplant:Show Image(http://img689.imageshack.us/img689/5696/transplant.jpg)
Aaaaand after:Show Image(http://img443.imageshack.us/img443/9320/frontvkl.jpg)Show Image(http://img20.imageshack.us/img20/7333/rearduck.jpg)
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Sounds like an interesting project, although it the keyboard is as small as I think you implied, there might not be many switches that would suit.
...If you were looking to design a Cherry MX switch based keyboard, but in a tiny form factor, a 40% board is about as small as you're going to be able to use. See kmiller8's thread here for more info on his design: http://geekhack.org/index.php?topic=38775.0. Maybe you could collaborate on that project?