That seller would be on my shitlist. Nice looking housing, proper footswitch. I can see what you mean about needing to tame the click inside of it however, as that type of material is a bit resonant. If you have a spare sheet of acoustic foam or an old bass trap in particular that you could shave a bit off of, that would be ideal.
The little metal ones as pictured on the right are a bit easier to insulate against interior noise because it doesn’t transfer through the body as much (rigidity) but the cheaper plastic ones as on the left act like a drum head and distribute sound throughout the whole thing. If it turns out to be a real firecracker kind of situation, you may consider affixing standoffs/posts to the base plate just shy of the interior ceiling height with some adhesive rubber feet at top of them used to make up the difference between the post and the top panel. They should act like Roman columns as to stiffen the chassis and isolate the travel of the noise a bit, so even if it’s like a drum, it’s like a tight drum. That way your additional insulation will be more effective in that it won’t be doing the double duty of having to both stiffen the walls and block the sound travel.
The metal box you picture should be fine but I’d be aiming to use the one that looks like a purpose made footswitch as I like that kind myself.
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