I will type out a detailed explanation on how I make dies for rubber pressing tomorrow after work. I re-drew, from memory, a simple hydraulic press which I used, several years ago, to press large batch decorative copper light switch plates for some custom homes. This press could be made in a few hours and is reasonably cheap. If you are interested in building it I can finish dimensioning and annotating it by the end of this weekend.
brad Assem1.PDF