Installing in a metal box - use nylon or metal headers?

I’ve got a hinged metal box that’s big enough for the LimeSDR. I’d like to screw it in to the box, but don’t have screws that mate with the nylon headers that came with it. I do have some brass headers and matching screws, and it seems that this would provide some good shielding, but wanted to check here first: it seems there must be a reason for the nylon headers.

Would metal headers that (probably will) electrically connect the Lime’s ground plane to the enclosure be a good idea? Thanks!

I didn’t use the metal ones I have because of the close proximity of some components worried me. Others have used them.

Bottom side without insulation, top with…

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