Here is the progress as of Saturday afternoon...
Since I am using two outer skins that sandwich insulation, I like to use hardened concrete nails that are 1" and weld them to the inside skin, and then the insulation will punch down on that. This works great on vertical surfaces, as it holds the insulation in place while I mess around and get the outer skin tacked on. It also serves as a method of keeping the skins separated by 1"...not that this is a problem with the heavy gauge that I am using, but what can I say...I'm an over-builder!
Here are my welds...not to bad for an untrained DIY'er using flux core weld wire!
Here the top is getting ready for some insulation...You can see the nails that I have welded in.
Here is the insulation that I am using. It is Superwool 607, and is rated at over 2000°. They use it in kilns and ovens.
Here is a vertical piece that is the first to get welded shut. Insulation is in, and the outer skin is going on next.
Vertical part of the rib rack is tacked on, and I'm starting to insulate the top of the horizontal chamber.
This is all you need to work with this insulation...it's pretty cool stuff. About the consistency of a really dense and heavy cotton candy.
Top of the horizontal chamber - insulated and ready for the outer skin.