I was looking for this and couldn't find it. I ended up adapting the dutch library object, which is of no use to you antipodes, but at least you know I couldn't find one either.
If you're not too adept at GDL scripting, you could just make an one off object with slabs and save it as a custom door object. A search at the Help Center link at the top should get you some posts, tutorials, wiki etc stuff to explain how that works.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nlArchiCAD 9-29NED FULL
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