Yah, it is pretty easy (relatively speaking), to get an arcade monitor working with a PC. Either buy an ArcadeVGA or use Advancemame with a Trident or Nvidia TNT2 video card.
But, on another topic, do you really want to gut a working Bad Dudes machine? If it's an original cab with artwork and the whole lot (and not just a hacked up conversion cab), then hacking it to bits might be kinda sad

But, if it is just some generic cab that has already been hacked up a few times, then I wouldn't feel as bad converting it to a Mame box.