I am trying to build the following machine (https://wiki.hackmanhattan.com/image..._eBook_1-4.pdf) which has a cutting area of 8.5" x 7.5" x 3". For my applications I require to machine hard woods for long periods of time and if possible in some very rare cases 10mm thick mild steel ran at very slow speeds for which bad precision and long machining time is not a major concern.

The question now is, what size NEMA stepper motors do I need to do this and is the frame suitable for my application? I saw within the document that the frame can be made to suit NEMA 23's, what size would be recommended and what controllers are recommended for this?

Please note that as this is a small low budget build, if possible I would try to keep the parts (motors and drivers) cheap (long lead times for part delivery will be OK). I have access to workshops, the time and material to manufacture the frame therefore, this should not be much of a problem.