This looks very cool. Would be a neat experiment if you had each component made in brass, aluminum, and poly and then compared frequency responses between each configuration/combination.
My only concern is that by isolating the plate from the acoustic frame, you're diminishing the frame's ability to be acoustic. If the plate doesn't make direct contact with it, then vibrations from the plate aren't really seen by the acoustic frame, and I imagine the user ends up hearing the plate/switches more than the frame. It does look nice though, and I would definitely buy one if given the opportunity.