Beautiful work. Nice welding and the Dynafile is a great invention too. Even my stuff looks good because of it but yours doesn't need it. LOL

OK so I have a few questions.

Did you design this unit custom, or did you have plans? It looks rather monstrous for something non-commercial. If this was one of your first, who was the mentor? This really looks doable.

How does the secondary burning process work? Is it finicky, or does it readily occur in the right conditions?

Can one down-size this kind of unit, or do they work better if they are larger?