I'll try Google, but I never had any real luck with them before. (I was trying to find scrapyards in my local area, and Google brought back everything that had to do with "Scrap" and "Yard" but no scrapyards) Still, it's worth a shot.
Since any material can be used, I think I may use real wood and metal, for that extra touch of realism. I've done it before, with some 1/6 scale models of demolition explosives. It worked out good, being very realistic (short of using accual explosives, thankfully.)