My experience is that screwed wood panel joints which are not also glued will vibrate and make noise. What I did is cut a single or double layer of bicycle innertube to act as a gasket between the wood panel pieces, and this eliminates any noise due to vibration.
Well i think its just really up to the distance between the screws, the thickness of the metarial / the material itself, and how exact the plates would close up. In theory you wouldnt need sealing if really everything goes as planned. i think ill try doing it without any sealing at first, and if it fails i try some soft materials for sealing.
FWIW from long experience designing all manner of electrical power distribution boxes for Nema 1/general purpose up to Nema 4x/corrosion, explosion proof mining apps and pretty much every Nema rating in-between; short of stainless steel or boiler plate, Benelex access plates is far more stable with much more rigidity with far less retaining hardware.
Also recommend using at least Nema 1 rated neoprene gasket material (if required) and design such that the overlap puts the gasket between the cutout, mounting hardware and adhere to its max tightening torque or gasket rating, whichever is least and typically is (well) below a typical male's so called 'calibrated' fingers, wrist, etc..
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