Thanks daxian, I appreciate your photo. I see now what you were saying, my firewall lip is on the wrong side. That doesn't make the foam a tight fit?
So do you slide the power pod completely into the fuselage or does the firewall lip (sticking up from the foam) rest on the front of the plane. Isn't the power pod able to move up and down because it is not a tight snug fit into the fuselage?
Even in this photo, if I were to rotate 180 degrees, there would still be a gap between the rails and the top of the fuselage. Is the pod not supposed to be snug inside the fuselage?
Here is what I did... I cut out another power pod with 6 mm longer sides, the firewall covers the front of the pod completely.
It slides in without any slop.