i do have one stepper motor, it resembles the ones in that video you embedded
I am aiming to create a cnc milling machine to aid in the manufacture of rc plane parts such as 1/8" ply fuselage parts, i was also thinking about developing an old cd/dvd-rw laser to cut it, but until then probably mount a dremel on it
and i was thinking along the lines of a flat bed of 40 x 40, if i have a shallow enough lead srew would that not work as a "gearbox" effectively?