I made a little more progress on the build. Mixed up some JB weld and filled some cracks and gaps. Nearing completion on printing and assembling the lid as well. Sure doesn't look like much yet, but it's getting there.
I have also gone round and round on the wiring diagram and can finally say I am finished. When browsing youtube again, I found a smiliar tutorial to the last one I linked, but it uses an ESP32 board and an app called WLED. WLED is amazing and super feature rich so I made the switch. Also, it doesnt require any knowledge of writing code to configure, something that I am still a n00b with. Here is that video tutorial.
https://www.youtube.com/watch?v=stSrw98UOV0
Power has been confounding me. I wanted to have something that was simple and straight forward. That said, I was able to find a dual power supply that puts out both 5v and 12v that will fit in the fusion furnace and allow me to be able to eliminate the step down converter. Decided to go with wago connectors for a 5v bus because they are easy and inexpensive. I switched the amp to one that has bluetooth capability so in the event I want to play some tunes, I just disconnect the adafruit soundboard and connect my phone via bluetooth. Only a few bucks more for that feature.
I have also developed an inner chassis for all of the electronics. Went with the honeycomb pattern to allow me to use a system of zip ties to secure everything. Here is a screenshot of the tinkercad file.
Blue is the ESP32 feather, adafruit sound board and the microphone. The orange are the WAGO connectors. Red is the power supply. Dark grey is the NOCO genius 2 and the amp board. The light grey is the audio exciter. The white strips are the led and the cover over those strips will be a clear 3D printed part that will be sanded to act as a diffuser.