Here is the finished cupola beside the stock Atlas cupola. Inside the window edge on the modified cupola, you can see the edge of white styrene I used to fill in the window openings. I also trimmed off the raised edge around the stock cupola then laminated a sheet of 0.005" styrene with window openings cut slightly larger to create window frames. The interior also has a sheet of 0.005" styrene laminated to cover up the window plugs.