10" is too small for a chip fuel, it can be done but not with out a lot of intervention. 10" is about the threshold for pellets vs chips. What I mean by the hearth diameter is the outermost diameter of what some call the burn chamber. On our machines the hopper outer diameter match this, if the " hearth is 10" I would call this a 10" gasifier.
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I run wood chips in our 6:"hearth with out problems… just sayin 
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How practical is it? 20 to 50 minute run time is not practical. If your going to run a small engine its just as easy if not easier to build it larger. You get better heat management, better fuel flow, longer run times and the machine is more tolerant. Im not saying it cant be done, I look at practical use of the machine. If we run perfect fuel that is dry we can do it too.
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Sorry, I meant 10" firetube gasifier 
No, our small system hold enough for about 2 hrs run time at 1.5 to 2 Kw
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