a common space for harmonic overtones
Nice work ! Now you have to post a sound.
If you have thick enough brass, folding might be unnecessary.
I just upload some pict of the one I made, which were way more simple than yours.
Its still not finished and not tuned. Still some brass scratching left - for vibrations to last longer and hopefully dramatically change this sound :)
Thanks for uploading. Yes, the sound is a bit short actually.
I'm slowly scratching that brass. Sound is getting louder and last longer!