My number one suggestion for building displays like this is to use construction grade bead board rather than craft styrofoam sold at places like Michaels. To begin with, it's much cheaper to buy it this way, but more importantly, it's much sturdier and less porous. Construction styrofoam is beaded and dense like the styrofoam that your houses are packed in. If the 4'x8' sheets are too big for you, most places also carry 3'x6' sheets.
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