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I don't think I would leave them out, although I'm sure you can get by without them. The cab corners kind of hang out there and need the support I think. I was able to bend a piece of metal and make the bottom 3" of one of mine and butt weld it in place. Are yours completely toast, or just the bottom?
If you don't have an inner cab corner, you'd be open to the outside air then.When looking into the corner from the inside of the cab, there is the hole that goes down into the cab corner cavity. The inside and outside cab corners make up this box down there. If you don't have both, you'd be open to the heat or cold from the outside.Unless I'm not understanding what you're saying.