Homebrew PCBs

I remember that a number of people on the group have plotters. As I 
mentioned in my DLP post, I would like to try a laser to strip paint 
resist off the pcb. Instead of a cnc, I'm wondering if a plotter will 
work. Questions:

1 - How good is a plotter's resolution? Can it draw (assuming a thin 
enough pen or a narrowly focused laser) 2 lines 4 mils apart?
2 - Can a plotter carry a laser diode weighing a few ounces (say 
60-100 gm) with trailing wires without its function being degraded?
3 - Are software and drivers reasonably available for windows XP?

I see that HP plotters are readily available on ebay (7450) - does 
anyone have experience with these?

Thanks for any insight!

Mark