Soooo, time for an update 
…
The new fixed daughter-boards arrived yesterday and I did assemble one tonight.
Optically not much of a difference:
I did adjust the silkscreen-text to my experiences so far 
:
The whole thing connected:
And we actually do now have a USB 3 device 
.
The two generic ones are the from the hub controller:
The USB 3 section of the controller:
The USB 2 part:
A quick AS-SSD benchmark:
The benchmark could be faster, but I used some Ali-express USB to NVME-adapter, so I actually don’t know what’s the limiting factor here.
Edit: That’s by the way a benchmark with the same SSD on the USB 3 5Gbit port on my Dell Thunderbolt dock:
So I’d say it’s a good result
.
I’m a little impressed (and proud ) it works at all!
I did also test all ports (so the cable in both directions on both ports), and it works with USB 3 in all circumstances.
The next step will be designing an enclosure .