hehe........you know i just had to poke you a bit on that one...............mine flies with an OS.91surpassII and has been fine so far, but as a long time builder/flyer of models of all types, i agree with you that the firewall should have had at least one plate of 7 ply 1/8".
and the funny thing is, the normal "liteply" that is used is the same stuff we all buy from Midwest that has "not for aircraft use" stamped on it.................maybe GP felt that "if we use two pieces, who'll complain"..............LOL