beginning steps to building my cnc

[scnc]

Thank you for all your replies, I have looked at all the feedback and redesigned the cnc. Please let me know what you think. If it goes over my budget then its not too much of an issue. just a few issues which I dont understand :

(As mentioned and illustrated on the design attached)

1) where does the driver go and how do we connect it to the steppers?

2) what would be the best rails to use and how would I attach and make these?

3) linear bearings which are the best to use? for the size of this table?

4) where would the belt go?? the belt in question is it a timing belt?

5) Also Im thinking of making the frame stand out of mild steel and the cnc bed frame out of aluminium box section. Would this be okay?

Thank you all!