Hi! So there's my second mini pc project. It's much better than previous( i guess). Let's talk about parts:

Motherboard How i sayed it just need to be MAX micro atx or smaller.

GPU I have single fan zotac gtx 1050ti mini and there's a little bit of space for bigger card but just remeber better use smaller card.

PSU I used normall pc PSU, but mine isn't modular. If you can buy modular PSU you'r in the heaven.

RAM Can be high, there's enugh space

CPU FAN And this is very important. To be honest I have intel cooler and trust it's working perfectly. Max temps in games is around 75-80 degrees Celsius, on desktop it's around 35-40, and still it's even silent. The best option would be some noctua low profile cooler.

Storage If you have motherbard with m2 slot just use it, I fit here 2.5 SSD disk and it's just ok.

Additional fans I mounted two additional deepcool fans to make it cooler.

If you have any question go ahead and ask. Models of components(Gpu,Psu etc) aren't mine