[ludovicotek]

^ Hmmm... wood will definitely work, but it's gonna be heavy as hell. Have you thought about using a thick foam core board? Obviously not as sturdy as wood, but if you get some thick enough, between 1/2"-1" thick, it'll get the job done. Plus, it's very light. Easy as hell to cut. You can paint it, glue/tape it. Pretty versatile and durable. I designed a warehouse that I want to build as a villain hideout and I was planning on using foam core for the structure.

If you have any art supply stores around you it should be easy to find. Walmart, Target, Office Depot, etc. all carry it, but usually only the thin stuff.