Given how very, very close to the original the text is for these classes seems to be, does this arguably run afoul of the MB license and/or general copyright infringement principles?
All the content has been carefully written and converted using the Mörk Borg core book as the direct inspiration. The one exception are the names of the classes, which likely falls under the category of names of creatures. We've contacted the Mörk Borg creators to confirm this is within the bounds of the license. If there is an issue I'll let you know.