So, yesterday Mr. Hoffmann was with us and gave the ok. So it will be a garage made of pumice (3mx10m) after all. Unfortunately, we have to take care of some preliminary work ourselves, such as the floor, electrical, and drainage. At that price, that's actually almost outrageous. A big disadvantage is the long waiting time of 3-4 months and up to 4 weeks for completion. Rekers would have finished that in 6 weeks. But if you have no other choice, you just have to swallow it. Many thanks for your support :)