Wood lathe copy attachment conversion

[Fivetide]

I used the open builds system to I bought a small lathe to make the copier , have done everything except replacing the lathe motor with a stepper. Not sure if I should do a direct shaft coupling or belt and pully. Also I'm trying to keep all the steppers under 3 amps and again not sure if this will have enough torque + rotary speed to do a nice smoothing final cut. I dont have a photo of the copier on the small lathe Ill post one when its ready but this is the copier on my table after I sorted out the grbl and steppers.

I've set the larger lathe up for hand turning and Ill probably sell off the copier.