I am thinking of mounting a fuel cell in the rear seat area... I know the cell must be separated from the cabin by a steel fire wall; now would the steel containers such as http://www.racerpartswholesale.com/fsafe2a.htm satisfy this requirement or would I have to encase the cell with an additional barrier. While on the subject, it is my understanding that this is the 'ideal' location for a cell as the weight of a full tank vs. an empty will have the least effect on the balance of the car. Am I wrong in my thought? Any suggestions on a better placement? I appreciate the help.