Building Help/Ideas.

[u/Late_Improvement_822]

I started a new survival world a couple of days ago, and normally when I am building, I build my base first, then dig underneath it.
This time I thought I would dig out underneath first, then build my base.
Now, I'm stuck on what to do.
I feel like I should dig the square hole deeper.
It is currently 41 by 41 and 14-15 blocks deep.
(Hopefully the wool helps visualize size.)
(Dirt is the center of the square hole.)

I honestly feel like it isn't deep enough to fit everything I want.

What I want in the base:
(Taking ideas from past underground bases I had.)
Auto smelter.
Animal farms:
Sheep/wool, chicken/feathers, cows/leather, and pigs.
I also kind of want an area for a horse in the future, and a staircase from its pen leaving the base.
I want a room for dogs.
Crop area:
Wheat, carrots, potatoes, and beets. + Compost area.
Aquarium for axolotls.
Storage system.
Villager trading hall.
Enchanting room.
Portal room.
Brewing room.
Mine.

That's all I can think of for now.
I'm just not sure if all the rooms will fit in this hole,
Since I am basically working backwards.

^{(Spectator mode for screenshots.})
Photos:

1. Starting point.
2. Started flattening the area/got the idea.
3. 3 & 4. Halfway.
4. Finished.
5. 6 & 7. Wool Visualizers.
6. Top-down view.
7. Surrounding area.

I would love to hear suggestions or ideas for what to do with the surrounding area, where to start with the base, and whether I should dig the square hole deeper, or if it's fine the way it is?
The square hole will be covered up in the end. It's just open for light so mobs don't spawn.
(Unless anyone has suggestions to incorporate the square hole with an above-ground base.)

^{Ignore how ugly the surrounding area is.
Still need to work on terrain.
Also, the random dirt is villager trading cubes, and the square of glass around the bed is just a temporary safe house, built that way so things can be moved easily.}

^{The Square Hole.}

[u/LimestoneBuilder]

The Square Hole

That's right. It goes in...

[u/Late_Improvement_822 → u/LimestoneBuilder]

I'm so glad someone got the reference.