Thanks Bill, I actually save this guys video on my favorites a few days ago before I saw your post.
I plan on building one that can handle 1/4" steel if needed, as well I will be making a break bending machine and hope to buy a bead rolling machine.
Small scale stuff, will be working in much lighter thinner stainless steel and will be using the machines to give structural reinforcement to keep them from warping from extreme heat.
I may do a video on the big shift I have taken.
It is due to a great deal of information from a couple of generous folks I interact with.
1/8th inch 309 stainless steel will hold up to pretty much anything you can throw at it.
I have been discussing with a fella who has built all his stoves out of it.
He has stoves that are over twenty years old and are still in service.
He uses break bending techniques to give reinforcement to the metal before welding, this gives room for expansion and contraction without having the steel warp from high temps.
His stoves are massive and will heat very large homes.
There is a study Gadily found on effects of heat transfer studies with different thickness and quality of steel.
The conclusions were that one did not need to use anything over 1/8th inch thick, but you did have to use stainless.
The reasons being were that the thicker the steel, the greater resistance to heat transfer.
The study goes into great in depth explanations with the math behind it.
Here is a link to the post that Gadily made.
https://woodstoves.forumotion.co.uk/t421-insulating-material-info 
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