Who knew you were a luthier as well? Those are some fine looking harps.
I had a harpist bring me one of her pieces to be repaired, glue joint had started to open and she had been slowly loosening the strings to take off tension. I looked it over for a few days and sent it back to her untouched. I'd rather not cost her a good instrument while I learned about fixing them. She talked with me about how harps are built and how dang much tension they are under when you add up all the strings. Her comment was "A harp begins to die the day it is first strung".
But in the meanwhile, they sure can sing...
