Hi Michael, I'm researching my first narrowboat vacation and found this again (used it years ago). As it is It will help build some canal skills but I also have another thought. I've been playing Escape Simulator (on Steam) for a few years. They have an active program for enthusiasts to create and share their own escape rooms through a Steam Workshop. I recently started learning their editor and am having great fun with their 3D platform.
I looks like you used Godot for Narrowboat Simulator. Even it you don't want to open up the project for new capabilities, I'm wondering if it's possible for people to contribute .pck files for new canals. I don't have a clue how anything works in Godot, but is this even a possibility? Even it it's just a few folks sharing through this group it could really open up interest in the project.
Scott