I am asking myself this question because at this point, I have a working prototype but in that process I have also come to some conclusions.
In terms of finished, I have completed the window frame, connected my security camera and demonstrated the project working. Based on the conclusions below, this particular project is completed but opens doors for a more advanced project.
In reaching this end point, the following conclusions have become apparent:
1. That in order to appear natural, a much higher resolution source is required, which would also require a 4K monitor and a PI able to drive it.
2. A 32" TV is too small to be a convincing window, unless it was in perhaps a small prison cell
3. This concept has merit beyond creating a fake window. Windows with embedded lcd films in them could be used to provide someone on the 24th floor of a tower with a view of a park, rather than another building.