I'm not entirely happy with the output of HelpNDoc for a few reasons. It outputs a great variety of formats, but doesn't do a spectacular job of any. I hoped to use CHM for local help but these do not scale well on high-resolution displays, and the technology will not be updated by Microsoft. HelpNDoc's HTML output is okay but not great, so I started experimenting with my own HTML to get exactly the look and functionality I want.
I'm going to focus on the format of the data and then I'll post a job on Upwork and find someone else to do the grunt work of filling in all the content.