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You'll have to punch holes in the side of the trash can wherever you are going to place a button and tie the wire in a way that the button pulls the blanket to the inner wall of the kiln. Make sure none of the original surface of the trash can will be seen on the inside of the kiln. You're almost done. Now all you have to do is neatly cut the blanket away flush with the large holes you made in the trashcan and you're finished. If you ended up like me, you'll have about ¼” or so of the bottom of the inside of your kiln that didn't quite get covered by the fiber blanket. What I do is place 2 layers of the CFB down on my base and put the kiln down on that. The pillowing action of the trashcan rim against the layers of blanket seal the kiln nicely.
In these pictures, I've added a few extras like handles on the top of the kiln, (you'll need those if you want to lift the thing off your pottery). I had an old pyrometer lying around, so I went ahead and attached that too. The snowy white substance around the bottom hole is Sodium Silicate to help hold the fiber blanket to the edge of the hole. I later found that this wasn't necessary at all and a big mess. You can see in the above photo the 2 layers of fire blanket on top of the concrete blocks. This is important to seal the bottom of the kiln and to prevent the concrete blocks from shattering due to the intense heat.