Only worked on that type of press once, that was at T/C in the 80's trimming trigger guards to length.
When I was doing Sheet metal we used Amada CNC turret punch presses using various shaped tools to cut out the part with all holes , reliefs and cut outs then formed them separately in the press brakes.
Pem nuts, studs, and other hardware were then pressed into the part as a third operation.
The type of mold making your Dad did is a whole career in its self.