Hope you like the design. You have one big castle for your brother. It has everything you need, it is very large, with many towers and floors. Its contents are as big as the building of course.
The entrance leads to the great dining hall which has doors on all sides and a table for 73 people. On the right are the theatre and record studios with around 30000sqm of space on several floors one atop the other. The box office has a double height and 120 seats. The castle is made with a large peripheral wall which houses over 178 rooms, each with its unique view of the landscape, along with 47 bathrooms and three great living rooms with views on three sides to be used in summer, spring-autumn and winter accordingly.
The castle is reachable via tracks and via boat, with a small special dock. Its largest tower is 287 feet high alone, and sits on a slighly higher part of the grounds so a radius of almost sixty kilometres can be seen from its top on a clear day, it has his main study and small record studio as it is the most mystical place in the whole castle. The waterway goes partly under the castle and can be traversed like a cave.
The smaller castle is for your guests to stay, it has 32 rooms with a common meeting room in the highest tower along with all the service areas, it is reachable via boat. The long building is a royal equestrian stable for your horses and has quite a lot of space with a giant guest reception room that looks over the property. And the water park is very very big and long for everyone to enjoy, with a large tubway and smaller pools.
The perfect enviroment for this kind of design would be a mountain with small lakes and rivers, adding the Loch Ness type of vibe to it. Travelling around the grounds would be best restricted for horses and boats, so the atmosphere is amplified, the size of the grounds is such that via horse, you can travel from one end to the other in around 15 minutes.
Hope you like it. If you would want go go further with the project, as plans and development, you can do that. Feel free to contact. It is a very large project and would need more comunnication and design drawings.