If you understood EMP a bit better you'd understand why the place you saw it posted before had negative reviews.
The sole purpose for a Faraday cage is to re-route the current around the object being protected. So cutting and pasting plates inside a case are of little value. You have to have a shield around the outside that is continuous, with no gaps (or inside with no gaps and your device isolated (not touching) the shielding material. The goal is not to have any current flow around the device.
Much better (and cheaper) to do this is get an aluminum trash can. Put your laptop and drives in your Pelican case (which is nice to protect against bumps..but is NOT bulletproof) inside. Take your copper or aluminum foil and make sure your lid is securely on with the copper or aluminum foil around the edges insuring a tight seal...no gaps.
The main deal is to electrically isolate the electrical device from touching your Faraday cage, and then ensure the cage is sealed.
Nice thing about using the trash can is you can unseal easily, and add gear to it easily.
I do have a metal camera case which might do as a Faraday cage, but I'd have to sacrifice the key lock and seal the edges better than it seals with just the snap locks.
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How to make a laptop EMP proof
EMP proof laptop