That socket 370 pin soldering is amazing precision work, very nicely done!
Scary stuff too, I have tried that before myself and ended up just ruining the pad.
This isn't a 'today' activity, but today I can use it - I got tired of trying to find an MT-32, so I printed one 😁
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It's got a raspberry pi 3 in there, with a proper DAC on it and MIDI input. More pictures here. It's designed to live in there permanently with the SD card accessible from underneath. It started off as a mess, became tidier. Now it's finished! (version 1 is finished... files will be shared once I make fixes and make a real PCB layout that people can make)
It sounds and works really well, having the extra buttons and finally a shape that holds it together is much nicer.