Just a heads-up to the builders here...
The fuel cell supports supplied by Mark are insufficient. The fuel cell needs to be fully supported across the bottom, and the flimsy little bent pieces of tin and pop rivets will not be enough. The fuel cell will weigh near a couple hundred pounds when full, and shock loads on bumps will be much higher. Try standing on those flimsy little pieces that come with the kit and see what happens!
I replaced them with some more substantial angle iron, and welded them in place. I also used 4 sections of the rear door gasket under the cell, and 8 - 8" long self-adhesive rubber strips vertically in the corners.
My battery box straps hit the fuel cell on the top rearward edge so I used some more rubber cushion there.