Have you considered asking Marin Gazzari (LinkedIn)? He's mentioned as the world designer in the "Making of..." series, the handbook credits him asMy friend and I wrote several times to Hannes Seifert on Facebook and Twitter -X (from which he seems to have recently deleted), and even a paper letter - he did not respond
Lead Content Creator
and his name is literally all over the .wld
file. I don't think he has the beta you're after, but he seems to be the right person to ask questions about a cut level.