OMG there’s tons of info on YouTube. I bought some sheeting on Amazon, originally for some RFID blocking pouches I was making, but as it’s essentially a very fine copper mesh it’s super conductive.

It’s essentially a folder sheet, sewn around the edges, with a copper grommets affixing a wire that has a plug on the end with only the ground connected. Super easy. Can take a photos later if you want.

This was the fabric I used. https://amzn.to/42RCqfp