Yo Guys! I have been working on my hack for some time and I almost finished my course 6 witch i pretend to release as a demo. But I need some help with the custom import and other small things. So, I am asking for a cooperation with an experienced hacker. Here is a pic of the course, but I can show more if someone is interested

Wow, that looks great! I'd love to collab but sadly I don't have the time.

Looks like a katamari level

If you want to import the stage model, just use this tool. I could help with your hack if you want but I don't have as much experience in SM64 hacking as other people here do.