Another system type that could cross all three of these categories (well made, pre-made; made in a hurry with resources still; made after full All-Fall Down) is KristijanL’s double flute hybrid charcoal and raw wood capable downdraft gasifier.
On one of his topics he did more than just propose this. Using his hidden Mercedes compact in-trunk heavy walled charcoal unit experience, and his woodgas experiences, he showed he even had acquired the HD tubing to make one up. But a night shift working DAD, on a developing new home farmstead we wait . . . priorities rule.
Dave in Australia says he did try this concept a bit. BobMac says he is 'abuilding.
And one other fellow who’s name will not pop for me ? ? ? Sincere Apologies.
Don Mannes did build. Trial. Then modify. Then to generator running. Here:
Scroll down for his running video and his asnwering questions.
We have common store black gas pipe lengths pre-cut and pre-both ends threaded.
I can see those in a heavy waal made up meatal box, or heavy round can (service pole transformer can) pipe flanges held in place. Then removable, replaceable when buring out beyond usage.
The interior could be outside each flute sloped down to each flute air pipe with SS cooking pot cutouts like Randomn shows in his video interior. Enough pipe flanges and fiberglass stove rope sandwiched and I could see this as weldless.
Welding would be better as lighter cheaper. But . . . needs Musts when the Devil drives the sleigh.
S.U.