Nice. Is that the style that also has a hidden compartment in it? I made one of those for my daughter when she went to college and put a couple $20.00 bills inside. The whistle was for protection when walking across campus at night. Unfortunately, the whistle sound was pretty puny and would not get attention more than five feet away.
I make a lot of those for my booth... they go pretty fast. I like the "secret compartment" ones best because they are a little bigger and easier to make.
Frank
If you put the wind into the whistle, it's pretty loud..