...Now that I was going to post about it...I forgot what I was going to say...
If you want, I can send you (only parts) of some of my files I've been using to organize my mods/get ideas via PM.
(I have alot of experience with organizing my own mods and I have 3 differant styles of doing it, so it might help.)
Edit: I just rememberred one of my ideas, it involved marines using guns for air units, and grenades for ground units.
Edit2: I just rememberred another, it involved having firebats place mines, and use rocket launchers for ranged-attacks.
(it's long ranged, but is defenseless at close range, thus requiring protection.)