At first I didn't really like how you handled the vowels, but since I can't immediately think of any better ways of doing it... ok.
So I'm still not sure how "'", ".", and "," are handled under this system. I see from one of the images that you put a little ^ looking thing underneath the "e" in "mi'e". So, is that part of the system or was that one of many creative ways to show it?
Also, I thought I remembered at one point that you (or maybe it was lakmir or someone else) had chosen vowels that made the diphthongs more obvious. It was something like:
i |ai | a
__|___|___
oi| e | au
__|___|___
o | ei| u
| |
Where except in the case of "ei", each vowel diphthong could be made by combining the two corners that make up the constituent vowels. i.e. |_ + _| = |_|
Did this idea fall through the cracks or did I dream it?
I'm guessing at this point there is no chance of changing the system without causing an episode, so don't take this as me trying to get up in larlermorna and change everything on you lindar. I'm just wondering whatever happened to the vowels.