Mike,
I must be missing something here. You have a wife from ground in your service panel to a copper bar mounted on a wood stand. I don't have any idea what the holes are for but am I correct that this wire going from the service panel to the copper bar isn't grounded in any way OTHER than at the service panel. In other words, you are just extending the ground from the service panel to a copper bar where you attach the grounds from your ham gear.
Chief