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Its not wood at all. Its textured vinyl. Depending on where you live it will be called different thing. DIY stores in Europe will have it called "Fablon" (a brand). Not sure elsewhere. Just be sure to clean the case with alcohol or dirt/grease remover first to make sure the adhesive lasts.
I suspect you have never heard of cosplay or steam punk then? I can see a lot of steampunk influence and can imagine a few cosplayers liking this.Personally i like it. Its a good instructable offering something difficult/impossible to buy.