25-year-old Sony MFM-HT25 (no long available at:
https://www.amazon.com/Sony-MFM-HT95.../dp/B0007SM8QE
Fed by a $70 Raspberry PI 4.
https://www.canakit.com/raspberry-pi/pi-4-kits
Via a chain of cables and hard-won adaptors. Some random powered speaker pair but once I sort the wiring, a powered subwoofer.
Here are 50 3D printable Pi cases:
https://all3dp.com/1/best-3d-printed...rint-3d-model/.
I've downed the low-profile
Snap Fit Raspberry Pi 4 Case & Stands and
Pi4 Case + FanCover with Camera Slot (wants high-temp filaments but I might try annealing PLA in boiling water). There're lots of miniaturized game consoles to run the Retro Pi, a Tardis, Han Solo in Carbonite, yadda, yadda. I like the printable version of the aluminum case on the first Raspberry Pi on the ISS.
Astro Pi Flight Case
The six push buttons and fiddly bits are available in a baggie.
Star Wars Death Star.
My son likes to paint miniatures. I think he could get that one just to paint, and put a Pi 4 in it just to control the lights.
edit: re-reading, maybe it's vehicular infotainment?
https://www.canakit.com/raspberry-pi...-case-pi4.html
https://www.canakit.com/raspberry-pi...uchscreen.html
This would fit the dashboard on my Metro, but it's an additional $170 (plus another Pi 4).
What about speakers?
This has me wondering if you could slump-mold acoustical ceiling tile material into the shape of a headliner. T'would be much lighter than a subwoofer in a MDF box.