Me and the boys were planning on a permanent bombed out Norman street scene in our backyard.

I was thinking of using Durabond. It's smooth 3 X 5 sheets of concrete for tile underlayment that can be cut. Since bombed out structures I've seen are mere shells with window openings, it could be done easily enough using some sheets and cinderblock. But, it would be a one way trip, it ain't coming apart for a family party.

Sorry to hear turnout was low.