I also made this rough humidity box for the stuartiana- a large plastic container, with four holes cut into the bottom corners, and two holes at top. I hope this can help improve the humidity levels for the plant, while allowing for some degree of air circulation.
This will be going back onto the windowsill, with the half of the box with the plant going to a spot behind a window mullion so it doesn't get constant direct sunlight, while the half with the paper towels will be in front of the window glass.