I'm doing similar. I have 2 lathes. One I bought very cheap. €70. I bought a kit from open builds which included the stepper motors. It's an 80 x 40 c section aluminium extrusion. Have the first part assembled. Made a mistake with the order and got 2 1000mm c sections. Should have got 1 and a 250mm one as well so my plan now is to get 2 250mm versions and I'll have enough for the 2 lathes. By the way both lathes have manual copiers already one broken and the other for bits.......Delta never used.