I've got a new project in mind.

I plan to make a simple system flute.

After having looked over my wife's flute and realizing that the keys are completely unlike my penny whistle, I knew I could never play the thing. However, a simple system flute uses the same fingering system as a penny whistle.

I've found several sets of instructions for these flutes, on the interwebs. Tomorrow I will procure the materials and begin the design process.