I have discovered that the concept-arts are not official ones. It is from the Bobbejaanland designer, but he would not have worked at Bobbejaanland since last summer. These concept-arts dates back to before that time and was perhaps even made unofficially by him in his spare time. This can still be the result, but there is therefore a chance that the themed area will be designed differently.
If it turns out to be like this then sorry for giving hope for this amazing unreal themed area which won't be built. Haha.