Hi lostbaka, the heart of the job is the punch and die.
The punch and die are shaped to the form you want to punch out.
For a low volume production,20 to 30 parts, a garage "H" frame type press, about 25 tons, would "do", as long as you have the punch and die mounted in a Die Set.
The Die Set will guarantee that the cutting edges of the punch and die don't interefere when coming together and "nip" the edges, also the part is located relative to the punch for allignment.
Enerpac make a variety of press adaptions and a "C" frame type is what you want, to go with the power pac you already have, but this will still be for low volume production, and is also relative to the tonnage of the powerpac.
This looks like a drill press where the frame is open to the front allowing the job to get to the punch.
The height between the punch and table will determine how big a job you can get under the punch, and the throat will determine the distance from the edge, the larger the distance required the less tonage can be used, or the more massive the frame has to be.
Is an Ironworker a shearing and hole punching machine used by steel fabricators for shearing angle iron and flats and general hole punching?
I don't think this would be suitable for your purpose.
C frame presses are the way to go if any larger volume is anticipated, and a 25 ton model is pretty versatile.
For this way you would need the use of toolmaking facilities and a skilled press operator, because they are dangerous beasts, and collect fingers at the drop of a hat.