For what you say you're Dad is going to be doing, you could probably drop down to an A6 processor. Unless he's storing a LOT of files on his computer, you can probably drop the HDD entirely and maybe put that money towards a larger SSD.
Other than that, you're probably spending more than you need to by building.
This Gateway PC will more than meet your Dad's needs at just over half the cost of your build.
Of course, if money isn't a concern, there's nothing wrong with your original build.
-Wolf sends