The Stovebolt Site Forums The Shop Area The Electrical Bay Grounding question

I am in the assembly stage of my wiring harness installation. As of right now I have a machine screw mounted on the firewall that is attached to bare metal on both sides that I am using as a ground for all things on the dash and firewall, is it a good idea to use one common ground like this? I am going to bond the frame to the chassis and run battery neg to engine block and chassis. Dave