The handbag!
The build with some pictures:
The Plan was to put stupid power into a tiny box. For the CPU that worked. For the GPU …
no, that nano is not working in a case that limited on airflow around the PCIe slot.
I had to switch that for the Sapphire 570 ITX, which is not bad… but, you know…
Otherwise the build was very manageable, not easy but also not terrible.
Most of the stuff is already mounted to the board. ¯\_(ツ)_/¯
Test with PSU sitting outside the case.
It is really just strapping cables together mostly.
Other than the GPU switch I also removed the back I/O cover to allow for more airflow.
Oh, and I only connected the red drive LED for power, just for looks.
And that’s it. 
Specs:
Lian-Li PC-TU100B
ASRock Fatal1ty AB350 Gaming-ITX/ac
AMD Ryzen 7 2700 with Noctua NH-L9a AM4
16GB (2x8) G.Skill Trident-Z 3200 C14
Sapphire RX570 Pulse ITX 4G
Samsung M.2 960EVO 1TB
Silverstone SST-ST45SF-G
Corsair ML120 Pro red