> The examples given seem to indicate that this is only a feature of 
> extremely high-end CAD products though.

There was a really good free CAD package called ProDesktop, but they stopped 
releasing it a few years back which was a real shame.  Maybe you can somehow 
find a copy of it.

A google for "free parametric cad" brings up some candidates, the first one 
called "Varkon" looks ok.

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