Dont feel too bad. before i started this campaign i sucked at terraining also. And im sure veljkom can agree with me there, lol. But i spent hours everyday reading tuturials, searching through terrain galleries and asking questions. And now i have improved alot since then. And im still learning.
About a month ago this is what my terrain looked like for the interlude 1.
Compare it to what i have now for the first interlude and you will note the improvement. Im still not that good of a terrainer, but im working on it, lol.

Im just trying to say that practice makes perfect. Dont be sad, just practice. lol. And thx BTW. it is very encouraging to hear other ppl say that they like what ive done.
Can you do anything else other then terraining then? If not, then your ideas and comments are still helpful.
Quetzalcotl-Out of the remaining chapters the only one's that ive put much thought in are The black temple and hellfire citidal(since allagremm doesnt want to do the terrain anymore then its open for now) So right now you would be better off doing one of those two. I will have to think about the other chapters later. You can find the detail and a base map for HF citidal in page 3. And heres the detail for The black temple.
The black temple will basically have alot of big rooms, with several guards around the map. You will start off playing as akama. Your mission is to make it to a room in the center of the map alive. The guards will be patroling everywhere. You will have to use careful timing to get past the guards without being seen. The bottem part of the map will be like that. You will have to be a little clever in this map. There will be several different things that you will have to figure out how to do to get past to the next part, like having levers and stuff like that that open doors and things like that. Dont make this to long because i dont want ppl to get bored of having to constently think, because you know how much ppl hate that, lol. Make this challenge something that will take about 10 minutes or less. In the room there will be an empty pedestal Once you go in here there will be a cinimatic. In the cinimatic it will show akama placing the Shards of the Naaru in the pedestal and castin a spell that binds them all together. Then the Crystal unleashes the power of the naaru reviving all the draenei that have fallen during the reign of magtheridon. They help kill off all the guards and then you get to be them and all that remains is illidan and his elite guards that will be in his throne room. Also kael and the other charracters that you have been previously using in the other chapters enter the temple. you will also be able to use them. And Akama disappears. The thone room will be a pretty big size. and in the back of his throne room there will be stair that lead up to the top of the Black temple. This is where the death of illidan will take place. your mission will basically be to kill illidan and once you got him down to the point of death. The final cinimatic starts. Illidan tries to retreat by heading to the top of the temple, but little does he know tat akama is there waiting for him and kills illidan. So basically for the terrain of the top part of the map,make 3 areas with buildible terrain and a gold mine. Those will be where the draenei are revived. And the rest of the area, just be creative. Add in some terrain and doodads to make it look more like the black temple. And maybe throw in a couple of shops. (dont use any the shop in wc3, they dont work well with black citidal terrain. you could even add in a unit like a storm weaver or something like that, that sells items.)
Hope that this is enough info. You can pic either one of these 2 or you could do one of the other maps(but you would have to basically come up with your own ideas. Sry if there any spelling mistakes, but it is too long of a post and im too lazy to review it, lol.
How do i get rid of that attachment thumbnail. didnt mean to post that there. Oh well theres another pic of my crappy terrain that i did more then a month ago, lol.