The drawing doesn’t have to be great, more just so you can use it as a reference and to solidify the path in your mind. It’s not even really required but I found it helped me organize my path and stations along it.
Here’s an example of one of my fictional palaces that I used to memorize Super Bowl winners/losers/scores. I created an imaginary football training facility and each area represented a decade. There were areas like Locker Room, Weight Room, Practice Field, etc. Within each area I came up with 10 items or stations that would logically be found there and linked my encoded informational imagery to those stations.
My area for the 1990’s is the Weight Room:
I did a super rough sketch of the different stations there, but it could probably be just as effective to simply use text labels.
It’s funny, I haven’t reviewed my Super Bowl stuff in probably 6 months, but just looking at this picture brings back the imagery I used and I can recall/decode it all pretty easily just by glancing again at the blueprint.