Roger, you ask about the suitability of sitka spruce for a camera. Not a good choice, in my opinion. It is very stiff for its weight, which is good. But it vibrates very readily, which is the reason why it is used for the soundboards of string instruments. Just tripping the shutter could cause it to vibrate....
Several people here seem to be picking different woods more or less because they look nice, or ,even worse, because they just happen to have some lying around. Since different woods have different qualities, I would much prefer to choose wood type on the basis of qualities desirable in a camera, such as
1 Stability.
2 High bend strength for weight.
3 Hard wearing.
4 Tendancy to vibrate.

There is also a good case for choosing different woods for different parts of a camera.

Alan Clark