Building a fuel cell rack got some questions

I'm getting ready to installing a 8 gal fuel cell on my 62 Valiant I'm planning on installing it in the trunk of the car positioned inside the spare tire well.
I'm going to try and make a mount from inside to inside of the frame rails with some structural supports between the two. I'm hoping by doing it this way it will add some strength to the back halve of the car?? Has anyone doing something like this if so can you post up some pics?

The rack will also have a place to mount my new fuel pump and filter but I haven't decided if I'm going to mount the pump in the trunk of the car or on the underside?
Thanks in advance