Alright, hoping it is the right prop, found some good info on it. I would only be able to make the case for this, but you can still buy the original PDA for this. The one used is a HP iPAQ Pocket PC H5550 H5555 Win 2003 400 MHz.
http://i.ebayimg.com/00/s/MzAwWDMwM...sJJyL-BRb9yOlH7!~~60_35.JPG?set_id=8800004005
Here are some pics of the ACTUAL prop from both sides
The outer shell will be in 2 halves, the front will be painted plastic, maybe vac formed? The back piece will be cut metal and probably have some way to secure them in a way that is easy to remove and put in the PDA. As far as the software for the device itself, we will have to find it. If we can find a good supply of the devices, I could perhaps do a run of them. This will be a fair bit more work than the crystal adapter though, but I will try to keep costs down.
http://i72.photobucket.com/albums/i...tuff/iPod Life Signs Detector/Propworx212.jpg