Following the many helpful comments, and especially the fantastic tutorial by revenant (thanks a lot, LuRker1313!), I was able to "ruin" my building with rather satisfactory results.

Here are pics of the completed version!
I've tried to use the keep the angles as similar as possible to the previous version, for easy comparison

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I had actually used a mixture of bricks cast from 12,000 psi dental plaster, and 18,000 psi Excalibur.
The Excalibur bricks were a real pain in the behind to chip, and next to impossible to break!

Bricks made from 12,000 psi dental plaster was much more "cooperative" :P

Note to self: Always use 12,000 psi or lower for ruin-type projects!

(Edit) Added a couple of pics without the miniatures, to show off my rubble!

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Last Edited By: angelbleu Jun 6 09 6:42 AM. Edited 2 times.