I personally would prefer to have the window to my right, so desk and book shelves & file cabinets on the left wall. The way that the door swings, this makes it perfect for a guest chair or two along the right wall.

Suggest finding an on line app (or measure/draw on graph paper) and include the structural components and the swing of the door into room. See what works best/meets your husband’s needs. For instance, the built in’s size requirements and in order not to overwhelm room, is a credenza sufficient. What size/type of desk is needed. I’d get these details worked out before deciding on layout/buying anything.

Because the room is narrow, I think an "L" shape would be best. I would do it with your back to the window because I like facing the door. Also in your case you don't seem to have a view out the window worth facing. The sides can have more shelving/cabinets than what's pictured if that's what you need. But I think you want about three feet of space to get around the desk if this is the way you decide to go, so don't make it too wide.

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