So you're thinking of having only 2 people on the Bridge at any specific time?
How likely might it be that this ship would encounter other ships? In that case you'd need Communications.
It would be weird for the Captain to also be the helmsman.
Every ship needs a medic. Especially on a ship where injuries from lifting, loading, carrying, etc. are likely (even if they have machines to do these things, machines can fail or injure people). And what happens if it's 20 light-years to the next stop, somebody gets appendicitis, and there's no doctor?