Unless the pieces of metal you are sticking together are totally flat and have no gaps, I would lean towards using an epoxy rather than super glue. In my experience (ceramic conservation, so not exactly related!), super glue becomes quite brittle and I wonder if it would hold up to the rigours of being handled and worn? You also end up with a lot of bubbles in the glue which I am sure weakens the bond it makes. Epoxy of course is more of a faff with mixing and all that but the bond is I think, much more superior.
You can buy epoxy glues that are specifically for metals but no doubt they are more expensive than conventional ones. I assume that you would be unable to solder the pieces together?
I would also certainly test any adhesives before use for potential reactions with the tins, as different brands might have different coatings which may result in the adhesive going a strange colour or bubbling furiously. The bond that is made might then be more compromised.
Sounds like a great idea you have! I hope a bit of trial and error will lead you to the correct solution!