As usual when I get to talking facts about the system on YouTube they cut me off. Hence why I try to dance around what I've always been saying. 

What have I been saying?

That's easy and literally so simple it's almost hard to believe. Don fum's mysterious directions are in a nutshell a basic plaintext that came from the ciphertext they titled The Marvelous Underground Journey of Baron Trump and his Wonderful Dog Bulger. This book is a cryptic Grid. Just as it tells us in the first chapter. 

Here is the paragraph eluding to this:

"This book, with its crumpled, torn, and time-stained leaves exhaling the odors of vaulted crypt and worm-eaten chest, exercised a peculiar fascination upon me. All day long, and often far into the night, I sat poring over its musty and mildewed pages, quite forgetful of this surface world, and with the plummet of thought sounding these subterranean depths, and with the eye and ear of fancy visiting them, and gazing upon and listening to the dwellers therein." Page 2

What I did was take each name and the italicized words and broke them down into acronyms. These acronyms all have meanings (of course). An acronym is a pronounceable word formed from the first letter (or first few letters) of each word in a phrase or title. The combined letters create a new word that becomes a part of everyday language. Using shortened forms of words or phrases can speed up communication or allow for cryptographers to convey messages without anyone's knowledge. Cryptography is the art of writing or solving codes. Each name had anywhere from 300-3000 line items I input into a database. 

Don Fum can mean multiple things. In fact, there are 2660 line items in Don Fum's full name. Don Constantino Bartolomeo