Joe -- An easy way to make a ground plane without adding any weight to the unit is to tape down appropriately cut strips of aluminum tape (used to wrap heating and air ducts) in the area where the tuner/preamp, and power amp chassis mount to the cabinet, and then mount those items down over the tape. The tape is conductive, simply and easy to install, and perfect for these types of applications. When the chassis touches the tape the ground plane is formed.
Your mini-console looks really cool!!
Dave
Your mini-console looks really cool!!
Dave