Cable runs are going to be important for th amount of wiring that is required for an IFR aircraft and so I am leaving nothing to chance.
I have purchased conduit that is spcifically for electrical and has no HCF. Cost a bit more.... in fact a lot more... however, I feel safer now.
I anchored the conduit to the ribs using wiretie mounting blocks and rivets. These will form a very strong and light mounting point for the conduit runs.
Paul (my electrical helper) has suggested the floors don't go down quite yet, so heading his warning they will go down after we have run the primary wires.
The holes in the ribs underneath the rear passengers is limited so that it will not have any structural issues.