What a find! I love it.
That cabinet would serve well for practically anything electrical. Gut it, put a few DIN rails in it, and you can have anything from a automation control cabinet to a load center for your workbench.
If you're comfortable with circuit board work, the green pluggable terminal blocks and yellow relays are some of my favorite spare parts.
With the capacitors, I imagine they could be used to make a super stable DC power supply - only thing is the inrush current would be crazy!
I notice what looks like a large switching transistor on the right side of the cabinet - perhaps that is worth salvaging too?