First Mini-ITX build EU-based

Working on a Mini-ITX build for the first time, looking for advice on the build / part suggestions for the European market (my first time building in the EU, 4th PC build).

Budget: €2250 (preferably lower, open to buying some parts used / waiting for sales)

Current part mix: https://pcpartpicker.com/list/KwGW9K

Use: Primarily gaming, the ethos is I'm trying to get the Steam Machine that I really wanted with AM5 and RDNA4. Not trying to hit actual Steam Machine targets / budget. Will put Steam OS on it.

Fun other things: If people have suggestions on HDMI-CEC or getting a Steam Controller to turn on the machine, I'm all ears.

Open questions:

• Any suggestions on CPU / GPU mix to hit 4K 60 with minimal FSR?
• Any thoughts on keeping it quiet, since this will be next to my TV?
• Any tips on actually doing a Mini-ITX build?