OK Patrick - your electrical flunky here. I'm not sure I follow the point of this.
My old Corvette doesn't have a neg battery terminal to frame ground and they are notorious for having to ground everything due to the fiberglass body. I don't even have a drivetrain to frame ground on my ERA (but I ordered one from McMasters and intend to install it at the transmission) - and I haven't noticed any issues with grounding. I assume this is just precautionary or have you noticed a problem?