> Can't a standard punch press handle this since it is so thin?
Punching really thin but hard sheet metal is actually a right pain. The tolerances on the punch and die have to be much tighter, which makes them rather expensive.
If you are making hundreds, consider laser or water jet cutting.
If you are making a small number, buy a carbide scribe (not a steel one) and some industrial/production quality tin snips. Not your local hardware store.
Then make up a template out of 2 mm aluminium sheet and mark the bits out one by one. Cut them out with the tin snips.
Ah, but the slots ... HARDER! Steel sheet templates, clamp on both sides, drill and Dremel.
If you are mad keen, make up a solid steel template, stack 20 layers of Ti foil together, bolt down really firmly and CNC with a carbide cutter. The cheap Chinese carbide won't hack it: you need German or Swedish carbide (HRC55+). (He speaks with experience ...)
Photos - too late. Once published, that's it.