The server will be split in to two unique worlds, the free-roam world and the battle world.

In the free-roam world, you can explore Hogwarts Castle and all of it’s secrets and recreate your favourite scenes from the films! Across this world you can complete mini-games and discover the castle’s secrets in order to unlock new spells and abilities. These spells can then be utilised in the battle world.

In the battle world, you’re plunged in to Hogwarts during the middle of an incredibly big battle. The castle is in pieces, buildings are destroyed, and no one is safe. In this world, it is magic PVP like never before, no one is safe, all bets are off, anyone can attack anyone. Survive in the battle world by teaming up with your allies and fighting your enemies. Duelling in the battle-world is the best and easiest way to upgrade your spells - the more you fight, the better your spells will become. There are a number of duelling arenas to also engage in, these arenas allow for more controlled battles between fewer players. The battle world also has a range of mini games for you to participate in, more details on these mini games will come closer to release.

Unlike so many Hogwarts builds in both map and server form, both our exterior and interior builds of our castle are highly accurate. By building these separately from one another, we’ve ensured that accuracy for the exterior does not compromise the accuracy of the interior, and vice versa. These builds are then seamlessly linked together, forming the most accurate interior/exterior build of Hogwarts ever built in Minecraft. This build is based upon the Hogwarts seen in Harry Potter and the Deathly Hallows part 2, and Fantastic Beasts: The Crimes of Grindelwald. Sources directly from Leavesden studios, the home of the Harry Potter films, have been used as reference to ensure that the castle is as accurate as can possibly be.
Our server is far smaller than other Harry Potter servers, and has a much greater focus on PvP and Hogwarts Castle as a location. Whilst there is always room for expansion to other areas of the Wizarding World, the focus on Hogwarts allows us to realise its full potential as a PvP arena. Other servers have very much split their focus on to multiple aspects such as RPG, Housing, Minigames, Dueling and more. This split focus has meant a compromise in server quality that we aim to avoid with a smaller and more focussed purpose for our server.
Hogwarts exterior is 95% complete, with notable areas such as Hagrid’s Hut and the Quidditch pitch among the final things that need to be completed. The interior, which will take far less time, is yet to surpass 50% in completion. With both these factors in mind, and further configuring and tweaking to be completed, we aim to get the server up and running mid-2021. There will be updates posted regularly, including further images and teaser videos. Please note that this date is only an estimation, and it is subject to change depending on a number of factors.

For higher-quality pictures, you can also visit:
https://www.reddit.com/r/Minecraft/comments/huhht8/hogwarts_castle_the_most_accurate_ever_made_in/
If you have any questions, please feel free to comment! I will try and answer all of them to the best of my ability.