Thank you, sjb007.

I've spent the last 2 hours working on getting the office "fixed", and I think that I might have it.

I've taken two distinct pictures; the first with the door to the hallway behind, and second from sitting in the armchair looking up. As you can see I've added roof windows that I downloaded from 3D Warehouse, as well as a light over the armchair for those late night reading sessions.