I'm sorry if this isnt the right sub for this

I'm considering building a small rig whose primary function would be as a NAS with the capabilities for plex transcoding. On top of that i'd like to add more services like home assistant and some others.

For now the build would be:

PCPartPicker Part List

​

Now im asking my self if it is the case to go for a bigger case so if i happen to find a good priced gpu in the future, this would double as a part time gaming rig. Would that be non-sense?Also what OS should i use in that case? Dual boot sounds like a bad idea but idk

Sorry if my english isnt perfect

Any suggestion on the rig per se are also welcome