I love this idea @nostone-unturned! I think this would be a better way to determine the 3d form of each letter because this way the z-dimension actual provides valuable information and allows people to understand pronunciation just by looking at it. I also love the thought of all these letters being arranged and then simultaneously hit with a mallet and bellowing out a decipherable word or phrase.
On a different note - It's funny you commented with this idea because I recently wrote a short story about a place where emotions can only be felt when they are spoken aloud, because the vibrations and resonances of the body are the only way emotions can be felt. And the compatibility of two lovers is only a function of whether the musical notes produced by their emotions harmonize.
Simple idea, hard to explain here without the whole story, but thought I'd share because you reminded me of it. Thanks for continuing to contribute to this 3d alphabet discussion!
I like the mallet idea too @erb lolz. This is really an awe-inspiring concept. Language will evolve in time just as it has always done. Language used to develop based on factors like the distance between other people who speak your language. We are seeing this now as languages form their own "online dialects." The digital space is the natural place for a 3D alphabet to develop.
I like you're story idea, btw.