Really impressing work Chris!
It looks very nice but also unrealistic (no offence meant - read further please...)
After my '50s Diner' disaster I started to look at tutorials about inside composites in Blender.
I realised that I made a lot of mistakes because I started with two 'open walls' left and right because I tought it was necessary to be able to have a camera view.
One major point in all the tutorials was that most of the artists forgot to put the 'lid' (ceiling) on top of the actual cube making the light coming from above while this is actually impossible unless you have a light hanging from or on the ceiling.
Now it is obvious that your composition is open on top.
With the ceiling on you can make a part of it in 'emission' mode so it looks like there's light coming from above but not the rather diffuse light like now.
Since you only see two walls the opposite corner should be extended outwards to have the necessary place to place the camera without the need to work with a wide-angle camera setting.
I'm still 'studying' the making of an interior so this is my limited knowledge until now...
But your work is way more realistic then what I produced!