Hi Bob,

Just an observation I had from the pictures, maybe you will do this anyway? You should have a backing ring, G10 glass sheet, or aluminum, something very hard, to distribute the head loads from the motor bolts and isolate the firewall from the heat in the bolts.

What I have found on the Pletty, and I am sure the Himax is the same, is that the bolts get hot during flight, and soften the composite firewalls. Over time they can become loose and fall out. While it has never happened to me, I had a friend have his motor rocket out the front of his plane never to be found again! I have personally had all but one bolt fall out, so I have been lucky

Just wanted to mention it in case you had not already thought about it.