No, those are for attaching the cowl to.

Just pin the firewall per instructions and you should be fine. I am in process of building mine.

My bud has flipped his over several times and has had no issues with motor mount/fiirewall strength.

Now, as far as the hinges are concerned, I have seen many CA Hinge failers. I would not put a $1600 plane in the air with them in my surfaces. I am using DuBro Heavy duty pinned hinges and others are using robart hinge points. I chose the DuBros because they have the same footprint as the CA hinges, which will effectivly use the backing blocks for the CA hinges better than the robarts.

It is all a matter of opinion. Why take the risk though when the cost is not much different.

Many may say that they have not had trouble with the CA hinges. Most will tell you that after a crash, that they did not pull out. Pulling out is not the problem, breaking at the hinge line is. Imagine a piece of metal, paper, fiberglass tape, CA hinge (considering that we add hardening CA to them) bent back and forth many times. What does it eventually do? Breaks. Pinned hinges are designed to pivot over and over and over with little or no wear and stressing. Don't get me wrong here, I use them (CA Hinges) all the time in my 40 size planes and love them, but that is a whole different machine size, weight, and effective load on the surface. Again, a matter of opinion.

Hope this helps,

Jason