Your instrument projects are due soon, and if you're looking for instrument making ideas, here are some links to helpful websites:
www.musicinventions.org
A TON of instrument ideas from all around the world.
Make Your Own Dumbek
This homemade version of an Arabic drum is really cool!
PVC Fraction Tubes
Use your math skills to measure and create this cool aerophone!
Homemade Tube Instruments
You can make your own tubano.
A Variety of Small Percussion Instrument Ideas
If you are looking for smaller instruments to make, here's a good place to look!