I could answer your questions but I'm going to be a little harsh and not answer because I'd be wasting my time and a worthy reply would take a lot of time. So I'm kind of going to be cruel to be kind, while saving my fingers some aching.!!

If you don't have the experience or the skills and maybe equipment to build a strudy machine, which from your questions you clearly don't, then I would think about buying an old VMC or Mill that is either dead or with an older obsolete controller and retro fitting it with modern electrics etc. This route will workout cheaper and with much higher chance of success.

Sorry if it's not what you wanted to hear but it is an honest reply with your best interests in mind.