I see what you're saying about reinforcing the mold strength, my idea would probably left wth a screwed up piece of metal and a destroyed forming mold. One of the artistic metal workers suggested using 1/8" copper which helped too. I was thinking too heavy on the tool itself and not heavy enough on the mold. In fact I could probably take a 2" piece of pipe, fill it as you said, and carve or impress (with Fimo clay molded to shape) and then press the metal in.
Wow! Thanks guys…I got a lot closer to were I should be. I knew you all knew about this.
Thanks for the patience shown in my quest. All that said, I probably misinterpreted over half of what you said.
Frank, I'm pretty sure I did on you suggestion (the tool itself will be used to impress hot soft glass – not much resistance there
, but it did lead to the next thought).