Originally posted by BigRussia
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There are spot welds are on the inboard side of the U shape, if you cut off the entire channel, your inner and outer arch will no longer be connected to eachother, you can solve that by welding the entire perimeter, which is what I have on my personal car, but obviously it will need painting on the outer arches at that point, you also need to be careful of heat control and warpage.
Another approach without welding is to first cut the U shape into the L shape, by removing the inner edge with the spot welds, and then carefully only cut out the inner arch part of the L shape, not the outer arch part, then apply panel bond adhesive and fold the outer arch over the now cut inner arch, and seam seal it afterwards, that is how a CSL is from factory.
Here is a CSL for reference.
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