It was many moons ago, but I recall this is correct. You had to place locations in a specific pattern for some of the mission items and it was totally possible to do with a single cart, just you basically needed a guide to figure out all the combinations to create the right map. It was not a trivial thing, and I recall using gamefaqs a lot.
Here’s a link to an instance of radicle for Yuzu. It’s a p2p git server implementation. I haven’t looked too much into it yet, but the tech seems interesting.