Can you do the trick in "Firewall Forward" on page 67, where he countersinks it with a spade bit so it's only 1/16" thick? You've probably thought of that, but maybe not.
I'm in the middle of punching a few holes in my firewall as well... Mark Langford, Huntsville, AL N56ML "at" hiwaay.net see KR2S project at http://home.hiwaay.net/~langford