Very good DWH (Dave)......you arrange the super caps a little differently (horizontally) to me.
I install them vertically with the + and - connections of the super caps are soldered together as a unit first. I also solder two wires (red & black) to the battery terminals inside the top section - red to + and black to -, then I install the super cap unit into the battery shell, and solder the ends of the red and black wires to the + and - contacts of the super caps, trimming the cap leads when I'm finished.
I also like to cover the top end of the super cap with Kapton tape, to make sure it doesn't short out against the underside of the terminals, inside the battery top.
Haven't thought about "gluing" the two halves of the battery case back together......hmmm, food for thought!!!
I like to wrap the battery case in red electrical tape, and then add my printed BCR sticker to it, just so there is no misunderstanding as to what it is.
And the BCR evolution continues!!!
Peter.....Buco Australia.