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I have answered this questions a few times in the last few days. I will have to re word the FAQ I guess I thought this was all in there.
Power-If you watch some of my videos, the first aluminum ones are using a flex shaft rotary tool probably a 1/4th the power of the dewalt or less. You can cut aluminum with a dremel. Power isn’t actually a big factor in precision, it is needed for speed. I know the physical tool size is covered in there.
Machine size- This is also covered in there. If you don’t think it was covered well enough tell me the tolerances you are expecting. All you say is complex parts. If you want specific answers you need to ask specific questions.