Brian, the stainless steel firewall is the first line of defence but it's the cutout for cables and wires that causes a potential problem. What I'm doing is attaching flanged stainless steel bushes with s/s pop rivets, and coating the saying surface with a high temp resistant cement. The cables and wires that go through the bush will be sheathed in a fire resistant tubing and any gaps filled with fire resistant cement.

I suspect what you EAA TC was talking about was if you were using rubber grommets. In that case, in the event of a fire, your toes might get a little toast ...