Episode 84 starts with a stack of birch planks and a plan: build up the towers at Basket Castle, put the floors in on the way, and save the cracked brick styling for later, since that is easier from the outside. Basket is the only player seen in the game.
Floor by floor
The tower goes up one floor at a time. Each floor gets birch slabs, torches so nothing spawns, and stairs that wind up around the open spots. Basket checks which way each stair turns so it "matches how it spins." At the top of the main walls, the gaps get filled in with plain stone for now. Slabs would give one room a little more headroom, but slabs can't be cracked, and looks win. "I think it's more important to have it look better than having a little bit of extra head space."
The tower at the back will become a larger royal tower. There won't be a way in from the main top. "You have to go through some more defended areas inside the castle." The secret doors get a detail too: each painting hangs on two signs, and from the inside, those signs can say where the next stretch of secret corridor leads.
A little building at the top
Two more floors up, Basket calls it the top of the tower. The stairs come out inside a small building in one corner with a door, room for arrow slits, and a ladder up to the very highest spot. The battlements on top are placeholders until the real design gets worked out.
The arrow slits go in next, all the way around. Halfway through, Basket realizes they might be facing the wrong way and goes down to a finished floor to compare.
Does it stand out?
To see the tower from far away, Basket throws an ender pearl, which seems to vanish, so it's a run instead. The verdict from a distance is not great. "It definitely does not stand out." It reads as one big wall of bricks. Long term, the edges might need a different material so the shapes show. From other angles the keep mostly hides behind hills and walls, except from the front by the library, where it stands up well.
Two kinds of arrow slits
Up close, the two front towers now show two different arrow slit setups. Basket likes the one where the slits look more spaced out, which also makes the inside bigger, and goes back up to flip the rest floor by floor. Then it's out the front door to compare the towers side by side. "I think I like this one, the left one, better." A viewer agrees.
One floor too high
That comparison turns up another problem. One floor in the tower sits a block higher than all the others. Basket weighs spacing the upper slits differently, redoing every floor, or dropping that one floor. Dropping it wins, but then the stairs land right where a door should be, and a door can't go on stairs. So that door simply goes away. The windows will come down a little, and the rest of the tower will drop one block. "That'll be next time." A viewer asks about the gate, and Basket explains it doesn't use redstone. It is built to look as if it worked. The episode ends with more torches and the shulker boxes packed up. The credits run to the end with no gameplay after them.