Just an observation. I know everything I read says to cut the hole for a deck plate or drill the hole for the breather after the finish is applied. This makes sense.
When I put my Kaholo together it was much cooler in the garage. Today I was wiping it down getting ready to apply the finish. I noticed what looked like some bulge between stringers.
So I drilled a hole in the final location of my Deck plate.
Air hissed out of that hole for 30 plus seconds!!
Its only 70 out, I cant imagine the pressure sitting on a beach all day.
So I think if you should at least drill a pilot hole in the location of your deck plate or breather. Still wont interfere with finish and will let the board breathe.