I made a steady back in Autumn 2020 during 'lockdown' when we were all placed under Government 'house arrest', so such projects filled in time and helped stave off 'cabin fever'. It was an 'MFJ' project - made from junk - all that I needed to buy was the roller blade wheels, some bolts and 6mm screwed inserts. I could have bought the knobs, but time wasn't of the essence so I made a little jig and made the knobs from plywood.
There was nothing unique about it - countless similar versions on YouTube, which I used for ideas. The main issue with any lathe is how to adapt it to fit the bed of the lathe - in my case, the cast iron bed of a Nova '16-24' (16" diameter capacity, 24" between centres). I cut the outer 'circle' on he bandsaw, and the inner circles with a router attached to a home made plywood circle arm cutter.
It took almost as long to make the knobs as it did the rest of the steady. Some self explanatory pics attached. To make the knob jig, I cut a hole in plywood using a 2" diam hole-saw, making a relief hole first into which the sawdust can collect or the saw will clog with sawdust and stall. Then I used a pillar drill to cut the five notches in the knob blank.
I've since disposed of the lathe and the lathe steady. I had it ten years, having listened to the mantra of "buy a lathe as big as you an - you can always turn small items on a large lathe but you can't turn large items on a small lathe". True that might be, but was I ever going to turn anything 16" diameter. Highly unlikely - I don't know anyone who does). Downsized to a smaller variable speed Axminster lathe - 305mm diam, 456mm between centre. Does me nicely.
Hope that's of interest.