Building a boombox with leftover car audio-schematic check

Hello all, title kind of says it all. I'm sharing a schematic for anyone to chime in of a build I'm in the middle of gathering stuff for. Trying to keep things on the lighter weight side by not including batteries for power storage. This will mainly be a shop box. Am I oversimplifying the wiring? Should I be concerned about noise in my speakers from the power supply? Looking for any insight from those of you with more experience than me. I'm kind of new to this. Thanks
 

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