@rulmismo Yeah, the screw terminals hanging out from the wall plug have gaps around them, open/electrified screws exposed so someone with a tool in hand might be able to electrocute themselves.
One step better would be to use an extension cord, keeping the female end. Plug your DC adapter into it instead of the screw terminals, then use the length of cord to replace your black and blue wires, cutting the extension cord when it reaches your plug on the right side and re-solder. At least this would put the dangerous part only on the right side which you could protect again with heat shrink like you have now, and you could even glue a little a thin box around it so it can't accidentally get pulled and touched.
That's kinda what I did with my cabinet. I glued some thin wood around the point where the AC comes into my cabinet and made a little box around it. My internal high-voltage power is just the end of an extension cord inside my cabinet.