Sometimes I've been wondering about how all maps are usually horizontal...
So I went to try if it's a coincidence or is it just somehow difficult.
For me, not difficult.
By using warp zones, I could make a rather large vertical map.
If you wonder, I decided to move back to UT99 since UT2004's servers seems to have shut down (I just noticed) and UT99 is much better and still much more popular.