This is actually an old project world of mine from 2017, but I figured I should upload it, for posterity.
Most of the stuff inside is garbage, but here are the big completed projects:

K3-KI: The 8-bit arithmetic calculator
... means calculator if you say it right in a certain language.
The calculator is hard to miss, and easy to break.
Inspired by a build by Newomaster, way back.

All of the logic is combinational, not sequential. In other words, there are no clocks and timers at all.
Some calculations can be wacky, for example, division by zero is a thing.
Another note: the multiplier is actually 5-bit.

SKTCH.256: Sketch, Save, Superimpose
The big colorful blocky thing right beside the calculator is a sketching machine. It reads the shapes you draw with blocks on a 16x16 drawing screen, stores it, and projects it to a bigger screen. It comprises two drawing screens, and so superimposing is possible.

DENTA9: The 16-bit arithmetic processor
My most recent addition to the world.
This is not a calculator. It is missing a proper input and output (they are in binary), does not handle negative numbers, and is extremely slow. However, it is much more of a proper processor than K3-KI (which is more of a glorified ALU), is infinitely more expandable, due to its more compact design. Unlike K3-KI, it is sequential, so it operates with clock cycles. The clock is approximately 0.08Hz.

Slideshow Machine
Not as exciting as the other two, but it does what it's supposed to. Very old project.


Feel free to adapt these designs/concepts!
Comment if you do, I would love to know.

I have also done numerous large solo cathedral builds, the renders of which are on my Instagram page

I look forward to uploading those as well, in the future.