Wow, thanks, Sid. Those are delectable. I didn’t see any of those when I did my own boomer-level search.
I still like the appearance of the one I linked to above, though it didn’t occur to me to check the nut width. I play mostly on a 1¾” nut steel string, but I can’t see paying that much without trying it, or without some kind of return option, regardless of the specs.
If you’re at liberty to name your builder, I would consider looking at his replicas, or yours. He makes yours at 45mm?
Also, there’s an older English guy on the net who plays on gut strings, he says (Rob something, coincidentally), so presumably they’re obtainable. I could make my own, I guess, but I don’t have a cat.