Two days ago I went and bought a key switch and 4 other switches, which will control the lighting. I decided not to buy new power and reset switches, since they would've cost 10 euros a piece, and they weren't that amazing.
Now some pretty bad photos:
I ripped all the wires off the front panel so I could take a closer look at the structure and so that I could paint it. The four switches and the key switch are on the right.
The front panel, naked.
And the case, also naked.
As you can see there are lots of hdd & floppy expansion slots, so it won't be a problem to fit in my floppy, 2 hard drives and a memory card reader that I just bought (which actually won't fit into my current case, it's now on the bottom of the case

).
ToDo:
- Try to exchange the key switch to a more suitable one, since when this model is turned in the "on" position, you can't get the key out ( -> ask from friends etc)
- Biltema with the paint and plastic molding stuff.
edit: Some early ideas for the paint job:
side panel
front panel