I just also got to messing around with strings, was kind of sketching something out last night for a basic single string-making rig, but capable of doing 2-color or maybe tri-color. As far as twisting it (twisting by hand takes forever), I would recommend a drill or dremel with a small hook at the end of it. Remember a drill on “forward” will make right-handed string, and a the drill on reverse will make left-handed.