At first glance it all seems so easy, you put together some slides, add screws to move them, motors to turn the screws, something to turn the tool and away you go.

Unfortunately home CNC is rather in it's infancy. Everyone has different requirements, there is no set formula for success on a budget.

You rather have to build a disaster to find out what the problems are. The only real alternative is to read lots of threads on a CNC forum like this and learn by other peoples mistakes. That's why you are getting flak, impatience will get you nowhere in this game. Appreciate that you are not the first to ask a question and that it would take someone hours to help you through the maze, humble is the best approach. We don't get paid for this you know.

There are two basic options, build a router or buy a mill then convert it. Either way there are pitfalls. The routers are flimsy things that depend on enormous spindle speeds to make the cut effortless so it doesn't bend out of shape. The mills try to overcome the bending by sheer weight of iron, but everything will bend, it's just a matter of degree. You quickly become a tolerance junkie.

Perspex has a bad habit of melting. you will need some way to get the heat out of the tool tip.