452 Card. If your main concern is noise, the homasote will make a huge difference. Then when you are done with the wiring, purchase a roll of convoluted acoustic foam. Fasten to the underside with pushpins and your layout will be whisper quiet, remember to face the convoluted side up. The majority of the sound is created inside the benchwork just like an acoustic guitar. The foam will absorb the sound like a sponge to water. If you need to get to the wiring, just pull the pushpins and fold the foam out of the way. In a controlled environment I have never had to seal anything and if stored properly I have yet to see Baltic birch warp EVER.
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