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I haven't seen one, but I also haven't looked. I would build it like a SFB with a propane burner rather than a grate for wood burning. Then just add some chips/chunks for smoke and let er rip!
I'm betting someone around here has built one of these. Keep checking in on it.
I can't see it being all that much different from a RF stick burner. Maybe a tent of sorts for lack of better words, to keep the ash from the splits or chunks off the actual burner. The rest should run the same I would think.