Here are guides for how to do most things in zzromtool. The most basic examples are given and kept as isolated as possible, but some later guides will require knowledge gained from earlier ones.
Why this tool was created, how to dump and rebuild a rom.
A basic example of how to add a new scene to the game. All the resources you need are provided.
A basic example of how to add a new actor and its object dependency to the game.
How to integrate a custom map created in Sharp Ocarina
Two Custom Maps
A medium-level example of having two custom maps routed together.
An example of compiling a custom actor overlay written in C.
Custom Animated Object
Integrating custom objects converted by zzconvert
Advanced Object Dependencies
Using zzconvert output in a custom actor overlay