Not just a single page telling you how to build your own Optimus Prime costume but a whole blog!

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DIY Optimus Prime Costume – Link. Thanks mmat.

DIY HALLOWEEN CONSTEST from MAKE, CRAFT, INSTRUCTABLES and POPULAR SCIENCE!
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Makers and Crafters, it’s time to enter our 2nd annual ghoulishly fun Halloween contests! Anyone, anywhere, can enter all or just some of the contests. We’ll have lots of updates and posts regarding all these, but this announcement is to get you started and planning and has more information about where to enter, and our friends @ Instructables and Popular Science – Link (how to enter!). Oh, check out the prizes too! – Link.