I've been disassembling the game ROMs and have figured out how the game levels are stored in the ROMs. I plan on using this information to create a level editor. Long term it may even be possible to add your own custom 3D models to the game (assuming you're willing to remove some models to make space!)
For the time being this program only lets you view the data in the ROMs. It's a work in progress.
The code and binary are hosted on Github. Feel free to reach out to me if you're interested in contributing to the project