Nice job! Looks like a 3 jaw combo chuck, don't see many of them around.
I just made an extended tailstock screw for my SB9 using acme threaded rod, didn't take long at all. I don't know what pitch/ diameter yours is, but it might be worth looking into how much a foot or three of acme threaded rod costs.
sorry I just looked at the pictures did not do much reading but are those the original oil daubers on the headstock?