This is the BEST gazpacho I've ever had in my entire life. The idea of putting it into cucumber cups is good in theory but doesn't work. If you carve out too much of the cucumber, the gazpacho leaks; if you carve out too little, then there's just too much cucumber. Just use this recipe for the gazpacho only and forget the cucumber cups.
Also, the step where you let it sit for at least 4 hours is very important. It's like ratatouille, the flavors need time to all blend together.