I'd echo the concerns regarding the fragility of Ti foil. As soon as you crease it, you work harden it so much that it will crack very easily*. And if you try to glue it with JB Weld, the foil structure won't be stiff enough to stop flexing, and flexing will peel and crack the glue.
You mention four pieces of foil, but I cannot envisage a way of doing this and forming a water-tight bowl; at least not without having some stopping of the gaps (hence the JB Weld? in contact with your pan contents? No thanks...). I'd initially imagined you were planning some kind of Ti origami...
Assuming the four pieces overlap, we now have four layers of metal on the base, giving us, say, 20 thou thickness. What's the weight of that? (Compared to a nice, pressed Ti bowl, for instance). Then add all the JB Weld stopping...
And, since we have layers, there will be a small air gap between, so conduction won't be great.
* this is even true of more ductile materials like Al. I'd experiment with the idea with Al foil or flashing, and see how long it lasts. Sadly, I don't think it will be long before you get pinhole leaks at the fold corners.