I wish there were plans for an OWB. I'm going to be starting a build soon, (as soon as I get my firewood processor finished), and I know what I WANT to do, but it would be beyond helpful if I had something to go by to confirm the way I'm going to do things. For example, I want an area under the fire to serve as the ash pan area. I also want to feed air to the fire from underneath it. P&M does this as well as a couple of other manufacturers, but the question I have is why doesn't the ash get blown all over the place from the forced air that's in the same ash pan chamber? As far as that goes, why does the ash even fall into the ash pan with the air trying to force it back up in the first place? And does that ash pan area sit right on the bottom of the water jacket or is it suspended so the water is under it? Same thing with P&M's exhaust stack routing. It goes from the rear, top of the firebox, comes forward to the front of the firebox, makes a 180 degree turn and heads towards the rear again where it exits to the outside. Is that whole assembly built IN the firebox or is it sticking up on top of the firebox in the water jacket? Each way would appear to have its' advantages.
I don't want to have the old 'I should have' regrets after building this thing!