I’ve done layout for 4/7 evaluation boards of the widget. There all two-layer boards with a ground pour on the bottom layer. Each boards costs about $2.50 from JLC.

Here’s the 555 MUX eval board, and a timelapse of the layout if your curious - https://www.youtube.com/watch?v=jSAdDRiDnlY.

Next, I did the BCD to 7Segment Decoder, and again timelapse if your curious - https://www.youtube.com/watch?v=kENF7PsEeCI.

Next the buzzer circuit, which I’ve already breadboarded; but I’m on a layout blitz so I figured I might as well. Layout video - https://www.youtube.com/watch?v=HsLt1bdORC0.

Last is the BCD counter. I should have paid more attention to the power routing of this board. Luckily there aren’t any fast/ high current signals on this board so I doubt it will cause any issue. I’ll keep an eye on it during validation nonetheless; mainly out of curiosity. Layout video - https://www.youtube.com/watch?v=oETrw1bGvMY.