Episode 111 is a short one, about ten minutes. The title card reads "Basket Castle North West Tower." The first job is refilling the ender pearl supply, then Basket heads back up to the work in progress: "we're working on the tower in this back tower." Basket is the only player in the game; the in-game chat shows only Basket's own lines.
The missing floor
The top part of the tower has already been cleared out. One part still needs work ("I'm gonna fix that"), but the first thing is to "fill in some of this missing floor," which is "probably important." The floor is birch, and the birch planks come out of a shulker box. The next layer up is stone, so that one needs no work.
Supplies for the top
Then it's up to the top of the tower with cobblestone, more cobblestone stairs and more slabs. Fences are left over from last time. The plan is the usual battlement pattern, with blocks replacing the tops of the fence posts and slabs on top of those. The middle ones get a stair instead, and the corner is squared off.
Before any of that goes on, the stairs have to go in. Basket almost falls, then "Oh! Darn it. I hate that whole slab, slab thing," and uses a ladder to get back up.
Around the top
The stairs turn around the corner, and both sides get the same pattern. A water drain lands in an awkward spot next to the stairs. "You wouldn't stand at this part of the battlements," but the pattern continues anyway. Next come stairs on top of the blocks, all facing the same way as they go around. Basket picks clockwise.
There's one spot you can't really get over to, which Basket decides "still works." The top might need extra light in the middle so mobs don't spawn up there. The video ends right after "let's put in the torches," before any go in.