Signal selector with a built-in Raspberry Pi, a DIY guide (Part 2 of 2)

This is a DIY guide of an audio accessory, which has a 4-to-1 signal selector and a Raspberry Pi 4b built in. As Pi could be configured in an infinite ways, as a media player, an Airplay or bluetooth receiver, or a media vault, the setup becomes a versatile and very high-quality audio source device on a budget. Audio quality is ensured by the I2S DAC integrated in the setup. This will make a nice addition to any home-made power amplifiers, which are often out of luck in terms of features. In this guide I made use of woodworking and connectors handling techniques. Also features information on various electric components.

This is the part 2 of 2, where I focused on the design and building process.
Contents are as follows:

0:00 Design walk-thru
4:56 Front panel building through a woodworking technique
16:12 Back and base panel processing
28:23 Wiring the components
38:00 Test and final thoughts

Here are links to the video related to this topic:

Part 1 of this series: concepts and components
https://youtu.be/2uPzUh1Y5vk
PCM 5102 I2S DAC guide for a Raspberry Pi
https://youtu.be/1T9PKLeBDFc
Making connectors with crimping tools
https://youtu.be/kzxBVLyWrfI
Building a signal selector module
https://youtu.be/FJYAjjtZnks
DIY Jigsaw table guide
https://youtu.be/WwiimDVNMYY

Видео Signal selector with a built-in Raspberry Pi, a DIY guide (Part 2 of 2) канала TinkerBox