Ok I know I will get flamed hard for asking this as I am a firm believer in safety first on all cars.
But I want to build a keg gas tank for the rear of my 26 touring car. This will be set inside the frame rails and have a bumper behind it to protect it from rear impacts. I believe the way I want to build it into the frame rails will be safer than the old tanks behind the seat in trucks.
Does anyone know where I can find some info to build one of these?

Thanks
Tim