Hi!
I'll explain how to make a Custom Track in Mario Kart Wii!
There is all the softwares you'll need for this video:
Sketchup : https://www.sketchup.com/fr
OBJ Exporter : https://tinyurl.com/3ytwhu79
Softwares&Textures : https://tinyurl.com/yxbmxlsm
Dolphin : https://fr.dolphin-emu.org/
Other link:
-KCL collision list:
http://wiki.tockdom.com/wiki/KCL_flag
-All game's filenames list:
http://wiki.tockdom.com/wiki/List_of_...