| Beefing
Why not just take a piece of Aluminum flat bar, 1" wide 2 foot long 3/16" thick, bend it to the radius in the section of the wall where the cabinet goes so that it fits flat against the inner skin/rib then pop rivet it in place with a counter sunk rivet to hold it in place.
You will have to drill holes to place the sheet metal screws back in the wall but the strength will be greatly increased. You will not have to be as accurate in the placment of the beefing material as you will have to be with the 1/4-20 nuts.
Beginner
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