I still got some work to do - but here is a first look at the new PCB, where the OLED is not on a module, but directly soldered onto hardpass.
Aligning the screen, so the solder pads match up, was rather tricky and took a few mintues. I used a small strip of double sided tape to hold the OLED down.
You can see it is now much neater! The underside is a little more packed now too:
you can see the two removed pins from the header, so the flat flex can lay underneath:
thanks for all your support this far!