I successfully made my first map for CW1 last night...completely from scratch and all my own ideas...and on my first attempt. I just wanted to thank Virgil for making such a great and easy to use editor for the game!
The only part I had a bit of a problem with was my fault, for not getting info on the three values for creeper emitters before I started. I had eight emitters on the map and on my first test they weren't any challenge at all. I loaded up a few other custom maps made my other people and found that my problem was using the default intensity of one. The next test I used a value of 10 on all of them...and promptly got flooded out within seconds.