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Dave,
I don't know about the xxxDs or xxxxDs, but all the xxDs have MOSTLY alloy bodies or to be more precise "chassis", as do the 5 & 7Ds. Probably 85-90% of the camera is metal. The 1Dxxx series uses a heavier gauge alloy and more of (virtually 100%)it combined with numerous dust/weather seals not present on the others. They are virtually indestructable, but I would think a bit heavy for use with a scope.
Despite their weight (or lack of), the 20/30/40/50Ds and their single digit cousins are all very robust. I don't coddle my camera gear (30/40D)and have never had an issue with them.
The website "dpreview.com" often shows the bare-bones chassis and that should give an idea about how much metal is used in each.
Hope that's useful.
Pete
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