Everything you selected for the build looks good! If you intend on using this for gaming then I would recommend installing a 2nd SSD to store all of your games. You could go with either an M.2 or 2.5" and the capacity is entirely up to you.
As for the 3080, I recommend coming into the store to speak with members from our BYO department. They may be able to hold this GPU for you if you are purchasing all of the components for the custom build. Unfortunately, this is handled differently by each store location so I cannot provide a definite answer as to whether or not we could hold this GPU for you.
Everything in this list looks fantastic.
A couple things that I would change. I would change your C drive to a WD Black SN750 M.2. I would then add an additional ssd or HDD for storage. If you typically play multiplayer titles, I would push for the HDD to save money. Load times aren't as necessary in this case.
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