Jeff,
Ash left from the immediate fire near the feed and burn chamber can be reached from the feed mouth (8"x8").
Ash can also be cleaned out after ?1 year? from the T I put right at the base of the heat riser and the T I put at the end of the longest length of horizontal floor pipe.
I'd definitely recommend firing at each stage of compeletion as Ianto recommends. If you have the time and the bricklaying skills (which I really didn't), play with the lenght of the burn tube and the length of the heat riser BEFORE you motar them all together.
Also play with the size and shape of the mouth of the feed and the heat riser -fire it for each configuration.... that way you'll learn what kind of problems arise and how hot each configuration burns at.
Good Luck!
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