I got the PCBs from China yesterday! 5 pcs, 75x100 mm, 4 layer. They are REALLY nice and professional looking, a far cry from the double-sided stuff I did in the kitchen 25 years ago :)

So far everything seems correct. Power supply lines are correct and the first 74LVC373 buffer works correctly. More soldering to be done and a lot more test-SW to write.

PCBs front, back and partly soldered