Using SM64DSe, replace the following .bmd file in your rom with the one included
in the "Majora's Mask" Folder. Instructions below.

SM64DSe can be safely downloaded here:
https://github.com/StapleButter/SM64DSe
For those not familar with this program, you launch it from SM64DSe/bin/Release/SM64DSe.exe
If you already have this continue on.

>>Backup your rom before proceeding!<<

1)Once SM64DSe is opened, click "Open ROM" on the top left and select your SM64DS rom.
2)Click the "File System" tab and navigate to -
                               data/normal_obj/obj_kanban/
3)Click "obj_kanban.bmd" then click "Replace (Raw)" and select "obj_kanban.bmd" from the Majora's Mask
Folder.

You should now see Majora's Mask instead of the notes on the wall. You can also interact with it as if
it's the normal object. Enjoy!


Addition info for SM64DSe here:
http://kuribo64.net/archive/board/thread.php?id=12

The Super Mario 64 DS rom used was (E)(Wet N Wild) which can be safely downloaded here:
https://sm64hacks.com/hack.php?id=439
>>These .bmd files should work properly in any version on the SM64DS rom. However I haven't tried them
on any other version. If results are not as expected please try to import them to this rom.

I did not make this model, I used blender to make it compatible with SM64DS