Thanks for the response, trurl.
I get the os usb and ram part of it. The part Im having difficulty with is the pool / parity and array detail. The end goal I have is to use the 2 4tb drives mentioned simply as a movie storage and if it can be done without any redundency that works just fine for me. This machine, in its configuration, is limited to 3 m.2 slots internally. The os USB is fine as there is no alternative, however if an idditional drive is needed to "start everything up" could that data disk be the 3rd m.2? Sure I would swap it for a lower volume m.2 if thats the case.
Your mention of the needed data disk in the array, would this also be where docker container data should be saved?
thanks again