Here's a sketch I just made of a cross-section thru the cowl area. From memory, so may not be exact, but you can see how the panels are sandwiched together, especially at the floor/rocker/inner cowl/inner-to-outer cowl. You'll need to cut it apart and determine how best to reassemble. As I mentioned earlier, you'll have to do some serious massaging of the inner cowl panel to get it to fit correctly.
As far as the outer cowl, that is the one that's critical as far as making the doors fit with the correct gaps, so that one needs to be at least fit temporarily first. Also, cut only as much as you need to get to solid metal. There isn't a need to get the whole outer cowl off for access, as the inner-to-outer spot welds at the front of it, and the inner cowl can be plug welded to the inner-to-outer from inside the cab.
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Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.