I've read the rules and can't find anything to indicate that the bulkhead separating the cockpit from the fuel cell /engine area can't be part of the metal can protecting the fuel bladder. Both are required elements. Is it ok to incorporate 1 side of the protective can for fuel cell as a bulkhead between cell and cockpit? The bulkhead will be padded and be the back of my seat and also serve as 1 side of the protective enclosure for the fuel bladder.