Not the first PSU I've built, but the first one that was more than an LM317, and built into a proper box
It looks nice. It could be improved quite a bit though, if you want to release the project at some point.
Fuse is in kind of a bad location, hard to shove your fingers in a corner to pull the fuse up. Maybe should be on bottom left corner under that to-220 with heatsink.
Maybe add connectors for those soldered wires on the left side of pcb.
Plenty of room to lay the four diodes properly .... maybe consider also dual footprint , for regular bridge rectifier (the ones very common used in atx power supplies , gbj , gbu etc, they can be screwed to heatsinks)
Could maybe rotate the to-220 chips and align with that to-220 with heatsink and maybe even with the bridge rectifier, so that a wide heatsink could sink all those chips. Also give them rigidity and whatever. May have to add insulators.
I'd rotate most through hole resistors 90 degrees , have most traces on top vertical and the ones on bottom horizontal , with ground fills or whatever for increased trace thickness.
The DISPLAY connector could probably be on the right corner/edge of the board instead of center, as the ribbon cable could block air flow going through case.
As for parts minimization, you could maybe add footprints for replacing those 47k resistors with 2 x 100k in parallel to get 50k resistors - close enough to 100k.
Not a fan of to-92 transistors, i'd rather make a board surface mount than use those.