What you are talking about as I see it is that you are wanting to mount a soundboard in between the slate and the crystal? Wow, you are talking about a very precise and delicate operation as you will have to do some internal measuring just as a starting point to locate the soundboard like the cream filling in an oreo cookie.....without it touching the ledge either piece is mounted to and having the right clearance between them so that the resonating will work on both striking surfaces the way it should in order to create a live sound and not deaden the pot. You could make a two piece pot, make your ledge on opposite sides, then do the same where the two pieces would be glued together having only enough clearance to hold the sound board in place, then drill your portal holes in the side of the pot instead of the bottom of the pot.
