Spent some time looking at alternate panel layouts. Reviewed feedback from friend and printed two more copies of the panel so I can cut one up and move avionics around. Looked for smaller switches.
Found and studied information on firewall insulation and feedthroughs on VAF forums.
Sent firewall penetration types, location and grouping questions to another friend and studied drawings again after getting a reply. Also reviewed additional drawings for wiring routing information and for control cables.
Shopped for battery chargers for the PC680 main battery and the TCW backup batteries. I plan to order the main battery and a single backup battery and their chargers to use during testing of avionics wiring.
Started working with wire spreadsheet to figure out how to use pivot tables to provide wire counts and lengths. Considering manual entry by wire number.