The wither boss temple

I thought that the wither and the nether should be more linked. They're bosses naturaly spawning in all the dimension but not in the Nether.

The wither is the best until now to be the real Nether boss but almost nobody kill him by the normal way in the Nether.

That's why I thought to a very rare temple in the Nether that should have the best loot that can be found on the Nether.

But that will not be so simple to have it because the temple will be very protected and 'cursed', that should have a lot of nether's wood signs that will tell to the players to not go into it because if you go inside you are stuck.

You could only come out of the temple by the room you are starting that should be a wither arena. You'll have a big room and when you go inside a Wither Boss will spawn and you should kill him.

The idea is that the wither boss can't go out or help the player to go out, that could have wither skeleton that spawn too (Maybe before you go inside the temple)... But the principal difficulty will be the Wither Boss in a small place.

That room I thought can be the first room or the later before the chest room.

The idea is also to have a temple that is not just limited at that room but a full temple accessible after the Wither Boss's death.

The last part of my idea is how to deal with the people that want to take the chest without fighting the wither. I thought to 2 ideas: the most of the temple can be above the lava level or the fact to break to enter cursed you.