Finishing insides of plates

On bottom - continue removing excess material to bottoms of guide holes. Leave as much as possible around middle area.

On top - remove material to get an even pattern of light transmission in upper and lower areas - leave thicker near middle.

Finish with Dremel sander for smooth finish. Aim for as light a weight as possible - about 70 - 75 g - but more importanlty, aim for a resonance around "E".