(about Oct to Dec 2024)

Thanks to the incredible adafruit team, there was nearly no need for 3D models to make from scratch.

Here is the github link: Adafruit CAD parts

I think only had to make the LED ring from scratch (the 18-LED ring is not an adafruit part). And LiPoly batteries are basically littls bricks. So after "some" back and forth (like is it easier to use a LiPoly which is thick an small or use a very thin with a bigger footprint) I came up with this arrangement:

View from the bottom.

violet: PushButton,  blue/yellow: DS3231, backup battery moved from back to the side, brown: Trinket with the USB socket removed. Green: stripboard (correct word? hole matrix board?) and top the mag connector.

And the vie from the top side. Top right corner: that is the piece of wood, which holds the M2 brass bold, the "handle" for the push button. The rectangle hole in the stripboard is for  accessing the IO pad on the bottom side of the trinket. and the ring that holds the LED ring in place.

Next layer of plywood holds the  components in place and separates the light of the LEDs:

On top of that the is the layer holding the Lipoly, directs the LED light to match the shape of the letters i the final layer and holding the LDR:

I thought I could fit a bit bigger LiPoly, but I had no small enough Pushbutton to make the room.

And the top layer with the actual letter cutout:

A keen watcher will notice the extra "M". As there was a "spare" LED anyways and having in mind, that at midnight the would be no LED on at all, I use the "M" for that.

There are some other options, like "24" or light up all LEDs as a "0". I might change that for another Prototype, when the 18h LED is used as battery indicator. Or some other variant,  I haven't thought so far.