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I made one out of an Electroluminescent panel and the cardboard box that it arrived in.
One thing to be aware of; It's amazing how quickly light changes during the day. It may look stable, but I was doing some tests and came to realise my results were skewed because the natural light was changing. No clouds or anything, just the sun moving across the sky. I don't know how much effect this has on flats in practice because I wasn't testing for that. However, it did give me pause to construct my own flat box that works a treat and is repeatable - no figuring out exposures each time.
Oh, and another thing, if using an artificial light source (especially one that relies on pulses of light like most LED panels, EL panels etc) you'll need to make sure your exposures are long enough to smooth them out; no shorter than 0.3s.
Hope that helps
Markus
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