That sounds like a very interesting idea, L'Aile -- though I'm not sure exactly how that would work.
However, since the names of the letters in my alphabet are supposed to be those of trees and other plants, probably the letter forms should suggest tree, branch, or leaf shapes. Working this out and still coming up with something that would be functional worries me a lot.
On a more positive note, I've come across a website that looks quite interesting, it includes something called a Language Construction Kit, and it sounds like the fellow who put it together really knows his stuff.
The URL is:
http://www.zompist.com/kit.html