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That's some serious work on the flywheel I do have to wonder if it would have been cheaper/easier to buy an appropriate piece of material rather than the welding consumables A 124mm (5") flywheel from RC is EUR 24.https://www.rcm-machines.com/en/flying-wheels/flywheel-cast-iron--124-mm,-partially-machined/rcsr124
Frustratingly, the camera makes the final results look far less smooth than they actually were.
I don't count the "globs" either, and a slow lathe certainly is a benefit. My south bend gets down to 45; slow enough.