Hi George,
drawing your ideas and perfecting the design will save you a lot of cash and headaches. There are many small details in a build, which if overlooked will lead to big waste of effort and money.
The parts for a solid topnotch 1000x2000x200 machine will cost approximately 2500-3000.

So, don't do that mistakes you are intending to do, read the builds here, take the best stuff and draw it. Sleep on it and then buy the parts.