Here and there you could do cheap. But if i were you, Nema 23 motors and profile rails like hiwin, new or used from ebay, these 2 are a must.
On such a small machine you actually need 4 rails, 2 left right, gantry, Z. Yeah, the Z will work ok with even 1 proper rail. With spindle 0.8kw i mean, no bigger.
Moving table and fixed gantry will even give further possibility to your build.

You could perfectly make the machine using belts without problem, though the 3 ball screws for that machine will be like 150. So not so much.

Having a drill is a must.

So if you are clever you could build a beauty on a budget. Spend more time designing and considering and less money wasted.

Don be shy from steel, cause thats the cheapest way to go. You will spend how much , 50-70 for the steel.

Better dont be in a rush, buy when you can and build slowly something that can make you money.

Or if you want your hair to be white soon, do a crappy machine that will make you swear every time you look at it.