Hi! I’m sorry that your first response is received 8 years later, but perhaps this info will help someone who’s looking for this through a google search:
This is a wonderful dissertation I’ve found on the subject that goes into detail about how each of the harps were constructed, what it was like to play both of them, and their differences in performance capabilities.
Also, any of Roslyn Rensch’s books will be useful, especially Harps & Harpists. I’ve also found a lot of information searching “cross-strung harp” instead of “chromatic harp” in google. Go figure.