I've been pondering about this thing for a couple of weeks - and the idea for such an extension is appealing more and more. Espesially when I started describing it here.
It should also be trivial to determine the thickness of the materials and group parts of similar thickness. One could go even further and group by SU material in case you got multiple materials of similar thickness (espesially for laser cuttting). And then one could either generate SU geometry, or maybe a LayOut document.
It's quite possibly that I'll be looking into this the next couple of weeks - as I'm starting my vacation in a couple of days.
I'll post back with updates if I make any progress.