All I had time to do today was install the firewall-mounted grounding block. I'm using a 48-position brass block from B&C. The large pass-through bolt is located very close to the negative terminal of the battery, so the cable run will be short. Every electrical item in the airframe (except avionics) will ground directly to this block. The avionics will have a dedicated avionics ground bus. [Superseded.]
The second, smaller attach bolt, an AN-3, had to be installed with the head on the back side of the firewall because of the narrow slot the block's mounting hole is in. I didn't have a proper high-temp hardware for it, so I'll have to change it out later.
I spent the rest of the afternoon getting my shop back into some semblance of order. It's been getting cluttered and messy lately.