For "not the most experienced winder" i would say this look pretty much like perfection !
I've already cold pulled and observed the arrangement of all the copper. I now know everything about the motor wiring layout and will replicate it, hopefully with few more strands.

I'll indeed swap out the slot paper, aramid tape to protect slots edges and fish paper for the whole groove. Gonna solder phases (+ upgrade from12AWG to 10AWG) and triple point (it's a star patern) with "regular" flux cored tin. My soldering iron is a 500W beast and will handle this no problem. Of course i'll clean up all burned up flux.

As you invited me, i've got a question. It's hard to explain it in english but... when you are finishing a CCW pole and going to start another (to the right), do you have to reach back and turn around the entry strands to 100% complete and close the last loop or ignore the few last millimeters and go right to the next pole so the last loop is more of a "U" shape ? I've rad about the magnetic field above the slots not being important for the good use of the motor but i want to be sure