As I said, yesterday Wolfgang and me were removing the water tank. To cut it short: We succeeded !! Here is the water tank that was hidden under the saloon bench. We cut it open to see where it is bolted to the ship. The pictures were taken after about 2-3 hours of work:
We also had to cut the inlets and remove the rest of the saloon bench to get access to all sections where the tank was fixed to the hull. After about 7 hours of work the tank was removed. Yay !!
…and one hour later, the saloon looked like this: