I just epoxied the firewall into place per the instructions.  Doesn't seem stong enough to me.  Then I look at your post from a couple of days ago and I see that you say you are going to glass the firewall in.  I was going to epoxy former 1D into place but I am going to wait to see what you do first.  That is assuming you get done playing with boats and zooming around on quads - tough life!</p>