My guess is that the biggest problem that you will face is the laser itself. There are some laser diodes coming on to the market which are relatively easy to use but still limited to around 2W or so (unless you pay big money for something that is electrically pretty fragile) but they won't do much more than cut paper or scorch wood. Maybe, just, cut thin balsa according to some accounts. After that, you're on to gas lasers with the power supplies, optics, and general mechanical fragility. And they aren't cheap either - you will be paying more for a gas laser tube and its power supplies than a 2KW router spindle unless you strike lucky on an auction site.

Mind you, the AXYZ oscillating knife assembly is just under £6000...