As usual when I scratch build, one of the most time consuming parts is the research and planning. While I do not draw any detailed plan, I do make a sketch and ensure it fits and has a reasonably realistic appearance. For this structure I am doing an Internet search for appropriate signs and posters. I contemplated some fancy lighting but will likely not do that - at least not for now. Most of my buildings are not glued down but merely set in place, so making later modifications is not difficult. Where I do glue the structures down they are merely edge glued with white glue so are easy to remove with a little water around the edges.
My layout is almost totally sceniced and I am running out of room to installed new structures. I have been thinking about tearing the layout down next year and building something new. I like to build structures and scenery so it would be interesting to do something new. If I do decide to build a new layout I will spend a good amount of time on the new design.