There are a few things that have always stumped me with unwrapping and they all have been simple things, and I wonder now looking at some assets in the udk editor that look similar, do I even have to unwrap it? Or can I just planar map it. Either way I would like to now how would you go about unwrapping something like this?

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Overlapping UV's for diffuse, with unique unwrap for lightmap? If there is more to the object maybe just have one section of the texture space dedicated to a small tile that you can offset the pieces a little to use unique sections of it.