Forgot to add that the parts we about the size of a half pound of butter and there were the ocasional screwup with the tape giving up. The jobs were aditionally held using conventional pivot clamps but in the latter stages ther would not be sufficient metal remaining to permit mechanical clamping. I don't recall the final cuts as being the problem as the breakaways were during the initial roughing out.
Hope this helps and you can find some suitable double sided stick tape.
Good luck and stay safe.