Since no one else has jumped in here, I guess I will. Others know more about the construction of these boats than I, but my observations of several bulkhead repair threads here seems to indicate that they are glassed to the inside of the hull. Removing would involve cutting out the old bukhead and "tabbing" in a new one. I seem to recall a repair thread where just the rotted portion of the bulkhead was removed, and new material attached in some way to the remaining good portion.