The critical difficulty with a camera is it's thickness. If you take apart a typical modern smartphone, you'll find that the lens assembly takes up the full thickness of the device, and often sticks out slightly. (use your favourite search engine to look for images of "smartphone camera bulge")
A lens assembly big enough to give tolerable image quality would be thicker than the Pyra's lid - and the Pyra is already a pretty thick device.
There might just be room for one in the base, but where? The sides are covered by your hands, the front and back are covered with connectors (apart from where the 3G modem sits) and the back has a battery in the way.
The only place where it might have been possible to put a camera would be in the keyboard area, facing up - which would only be good for photographing your own nostrils.
Cameras are tricky things to design, because of the strict lens geometry requirements, and the high-bandwidth data connections they need.
Aside from those technical reasons, there are also privacy/security concerns, and people, (me included) who don't really see the point of a camera which can never be more than mediocre.
This isn't to say that cameras are bad, or that the Pyra is better without one (although some people would say that). My point is that the idea of putting a camera in the Pyra was considered, and rejected for sensible reasons.
If consumer electronics design was a pick&mix, there'd be a lot of engineers out of a job, and the latest releases from apple et al would be more impressive than simply swapping one connector for another and changing the corner radius.