This is a question for the guy who are running a fuel cell and have made a rear firewall to seal off the truck. I would like to know how you went about it and possibly some pics if you have any. Thanks

I made a templet out of cardboard then cut the metal. I sealed it with high temp silicon then pop riveted it to the package tray and seat back support. The edges were a little rough but I planned on covering it with carpet anyway. Looks clean and passes tech.