Factory, design flaws caused A380 cracks

news.yahoo
If you ask me, if you take just a frontal view on the a380, you see that the engines are placed pretty far to the outside. It is quite obvious that they cause vibrations if not placed close to the torus. Furthermore, they are quite big. They needed less heavy engines as well.
I think the best idea for a plane in terms of vibrations is always a concorde style solution.
2 twin engines right next to the torus.

picture 61 (of75)

as a comparison: vibration potential of a dc-9

DUBLIN (Reuters) - Airbus blamed a combination of manufacturing and design flaws for wing cracks on its A380 superjumbo but said it had found a simple solution to the problem, easing concerns among analysts who had feared the issue could dog the European plane-maker.

In unusually frank remarks, a top Airbus executive said it had established how to repair the cracks found on a small number of parts inside the A380's wings, which had prompted European safety authorities to order inspections last week.