Follow this to set up armips https://hack64.net/Thread-Importing-C-Code-Into-SM64-Using-n64chain-and-armips
After armips is set up, clone this repo
Copy a big endian mario party 2 rom named mp2.z64 to rom/mp2.z64
Also copy a big endian mario party 3 rom named mp3.z64 to rom/mp3.z64
Run python ./configure.py to combine the roms and generate a ninja build file
Run ninja to build the project, which will output to rom/mp3-mp2.mod.z64