This should be incredibly obvious! But I shouldn't discourage.
It took a while to make. 4 hours over the course of 3 days. I say it was worth it. And it was pretty fun to test out that whistle.
FYI: I used the instruments from the MegaMan TT FTM, and added a few of my own. I hope that's not a problem!
EDIT: 1:36 PM (AZ MOUNTAIN TIME)
Made it better. Can't explain how.