I have a ground bus and a power bus in my '28 Canopy Express. These are primarily for the light and ignition circuits.
The power bus is mounted on a piece of 1948 hardwood floor material.
The ground bus is a flattened copper tube that is grounded to the firewall.
Cheers, Dean
Last edited by Rustoholic; 12/13/2022 8:59 PM. Reason: added some info