I'm strickly a player, not a builder, but you can get cones and cover plates from Frank at www.republicguitars.com I would suggest you contact (Darren "Big Daddy" Dukes) and (Jim Mitchell) Search in Members. They both build reso CBGs and I know they will share some building information with you. Happy building. Enjoy.
Welcome aboard, Terrance! You will find lots of helpful folks and information here on all things CBG (CBB, CBU, etc.) Feel free to poke around, ask questions, and post your stuff (photos, recordings, videos, etc.).
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Most of all, have fun!
Tres.