I've been meaning to make one for a while now and a few days ago I decided to actually do it.
Frame
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Front before I cut the camera hole in it
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I used white baking paper and I think it works pretty well.
Finished box with lights
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I experimented with using the skinny red lamps from the front for a couple of the photos and I'm not sure if I think they were an improvement.
Without red lamps
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With red lamps
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The rest of the pictures, taken with different white balance settings
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I think the pictures turned out pretty good(at least by my standards) but with some tinkering I think they can get even better.