There are hundreds of these types of maps out now. I think they are dying out, so unless you can give it something very original, bringing out and attribute that the other defence maps don't have, I'd recommend not making it.
1 more thing... The final version will have over 1000 triggers???
If so, in my opinion, you are doing something very wrong. There are ways you can save yourself alot of time and effort. If you want to know more, please contact me. If you are an experienced map editor, then I take that back, and I'd love to know why you need so many triggers
BlueWire