Hi Reyes, the burner you have is for cooking, heating up a large, flat area. This will not work, unless you plan on incinerating in a large frying pan. Not recommended. Propane manifold, with a variable intake is what it will take to get to the 2000 F area, most useful for what you are trying to do. Kaowool is called Kaowool. I believe it is spun from high Alumina, molten clay. Much the same as how fiberglass is produced, but has a much higher resistance to thermal break down. If you are on a super tight budget, you can't beat how Jason from Mount Baker Mining and Milling, constructed probably the easiest, most effective furnace I have seen. If you haven't watched any of his Youtube videos, I think you can learn a lot. There are also a plethora of videos on how to make the burner.
I prefer certain specifications for my furnaces, so as somewhat of a purist, I like having a door in the front, pyrometer, vent stack, etc., all in a fire proof area.
There are a lot of different heat ratings for fire bricks, as well as a lot of different characteristics of the bricks themselves.
Fire bricks come in light weight, insulating style, best for lining the inside of the furnace, high density, great for the outside if exposed to the weather. You want to protect the light weight insulating style from moisture and weather.
My favorite small assay/cupellation furnace, I found in the trash, sitting on the road. It was an electric Cress ceramic firing kiln, inside dimension 11 x 11 x 11 inches. The element was burned out, so I stripped it, cut a 2" hole in the side for a small weed burner head. Cut a 3" hole in the top to vent it. I was out $50.00 for the torch head from Flame Engineering. As a side note, look on eBay or craigslist for a ceramics kiln cheap. Then convert it to a propane fired smelting unit.
I buy my light weight fire bricks from DFC Ceramics, Canon City, Colorado. They have a great line of various clay crucibles, fluxes, and most stuff necessary for the stuff we do. I don't know if they carry Kaowool though. The only problem with them is that you have to buy in cases only. They sell to all the big assay houses, so small guys are hard for them to deal with.
In short, I would not waste my time with any of the apparatus you have presented in the pictures. By posting them, you have saved yourself a lot of aggravation and frustration. Good luck.