Your best bet will probably be to strip it down to the base components, losing the proprietary control system and substituting a computer running something you can figure out how to run, like LinuxCNC, Mach3, or UCCNC. I doubt it would make sense to do major modifications like you're talking about; ending up with a machine that can make really small parts accurately is probably the best you can expect. Figuring out how to get that laser measurement system working again will probably be the biggest difficulty.