I got interested in the ESP32_CP400 project and did a study to see if a version using through-hole components would fit inside a Patola PB-087 enclosure, which measures 96 mm deep, 72 mm wide, and 30 mm high at its thickest part.

Here is the enclosure:

For this study, I followed the original project. Although it doesn't include the full schematic, it features board images showing a few more 3.5mm jacks: two for the cassette recorder, one for audio, and one for an RS232 interface. I managed to fit three jacks, but it should be possible to add a fourth one, either by changing the jack type or by removing the power switch to make room for the audio jack next to the VGA connector.

Original project board:

Case study: