We already have so many plugins for this, this is bound to be unapproved.
See:
-
[Any] Deluxe Godmode - This one is exactly like yours and it was released back in 2009. It still works perfectly, too.
-
SM Godclip
-
Godmode on Spawn
-
Godmode Until Attack
-
[ANY] Advanced God Mode + Spawn w/ God Mode - I made this plugin, it was released back in February of this year, and it was Unapproved because it did everything that Deluxe Godmode did.
So yeah, sorry to tell you what I told you, but this is going to be unapproved.
EDIT: Just noticed your features list which includes anti-airblasting, sentries not targetting, etc. Whether or not that is enough to save this plugin from doom isn't up to me, but I will download the source code of this to see how it works because making players unable to be airblasted is something I've always wanted to figure out.