I made the brick walls out of insulation foam which I sawed down to about a quarter of it's original thickness and used the tip of a ball point pen to press the grooves into the wall. (I got this idea from Zebra88 on Dakka dakka. The rest of the rubble is just cork and sand.
I'm pretty happy with the results. Let me know what you think.
/stolen
ReplyDeleteGreat job! Going to build one myself.