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For the last part of the firewall drilling, I have to locate three more holes: the wire bundle penetration and the two cable penetrations.  The three circles indicate a rough location for them.  It may take me a week of thinking before I drill them

    When I do, I can start to run wire through the top hole.  Of course I have to decide how big of a hole.  From my electrical plan, I counted all the wires and took a snip of the correct wire size about an inch long for each one.  I then bundled them together through a grommet that I thought might work.  It looks pretty good.  I do plan on running some spares like I did in the wing. They will fill out the bundle nicely and I think I have the right grommet.