Unfortunately I cannot use the lost wax method.
Stretching up the inner liner instead of soldering it would work. I am trying to attach a pic of my copper prototype. The gold ring is flush with the two silver rings top and bottom, so the the silver liner would have to slip inside the silver-gold-silver assembly.
With the prototype I soldered all four rings together, then hammered the ring to texture and to get it to the right size.
So when I use the non-solder stretch fit liner, would it be best to hammer the outside rings first, then pressure fit the inside liner. Also, should I try to roll the liner across the top and bottom of the ring, or cut it off flush on the inside?
I really appreciate the input. 
