When you get to wire up your panel, you’ll notice lots and lots of wires going from various instruments to ground. If you are using the Fast On ¼” tab method for wiring, you can buy a ground block from B&C specialty products (http://www.bandc.biz/) that will make the grounding easy.
Or, you could make your own:
I cut each of these “adapters” in half (using wire cutters) and then took a piece of 1/8” angle and drilled 5/32” holes in it. I proceeded to rivet the adapter connectors with some 5/32” rivets I had laying around, and just bolted the whole thing to one of the angle stiffeners on the fire wall. Be sure not to paint/prime this, as you want good electrical conductivity.
I chose to rivet the connectors 3 at a time (with a single rivet) to save space, but I suppose you could rivet them any way you like.
There you go, you can have as many connectors as you need, and with a little ingenuity tweak the design to suit your needs. If you like, you can use conductive epoxy to connect the tabs to your bracket, instead of - or together with - rivets.
This custom ground block cost less than $5, for 36 tabs.