Selecting the best leg was not hard. The thread for the sleeve nut did not look good on one, even though a spare sleeve nut screws on to both legs without jamming:
Sorry about the quality, but this one had some scars from a hammer or pry bar:
This one had only one scar:
The one with good thread had this bolt in it where the lower mudguard stay bolts on, but it cleaned up OK with a 5/16 CEI tap:
I helicoiled the threads that take the lower cap retaining bolts, even though they didn't look bad; the other fork leg on the bike has had this treatment, and I want them to look the same. So both sides have UNF bolts where originally they were CEI.
Got the leg back from the powder coater:
The dull finish is from oily hands; I had to clean the inside of the leg very thoroughly to get rid of rust, blasting media and overspray.
Now I just need the time to put it all together.