I have a pic on my website of the servo trays which are the same layup as the firewall, when I get home I will post more that I have on my local drive.
http://members.shaw.ca/patternwest/technical/ch.htm
It is important to use the correct cell size to help prevent crushing, but the pictures I have at home describe how I keep it non-crushed better. I saved probably in the neighbourhood of 4 ounces on my Vector, and have a much stiffer mounting for my servos.
If you guys are interested, I can make this for you, I have all the stuff here to do it finding nomex of the correct weight and size in quantities that are small is tough from my experience.
Anyways will post more later, work calls