This is a great campaign! I have the book, and it follows pretty well. I really like the way you changed a few things to better make the gameplay.
Now, for some issues I found. (Only on Chapter 8, playing the good guys, need to do the other one later)
-Chapter 6: Orcs attack after first town is libereted. By using cheat codes, it is the very topmost one. I do not know if this is intended or not.
-Chapter 6: Also, while they were attacking, I went ahead and charged at the base (bottemleftmost), thinking that will stop the spawn. Am I supposed to go to the other base first, or attack?
-Ch 8: Krasus may not land after Dragon Form (Already known)
-Ch 8: The orcs still attack during the Renunion cutscene. May be intended, but I lost alot of towers and my men...
-Riddle Level: I didn't have the wrench at the Police Station, yet the guy said something about it. Later, I tried returning to him, as he had an ! above his head.
-I wish I saved replays of the problem, but I didn't... Only way to confirm is by other players or more playtesting...
Anyway, this is an GREAT campiagn. I also played your other one, but I like this one better. I don't like the Horde that much...