https://lew-palm.de/reticulum/index.html
I found this very helpful guideline for implementing Reticulum. Even if you don't want to do a full implementation yourself, it is a great addition to the Documentation of Mark for understanding Reticulum (at least from a developers perspective).
It seems that this guideline is from the same author as leviculum, a Rust implementation of Reticulum.
I hope it helps anyone. Cheers!