One of my beefs with ESB was the giant wind vane in the center of Cloud City, or the window on the vane to be precise. After Luke gets blown out the window we see a wide angle exterior shot of the vane. It shows the window that Luke just got blown out of near the very top of the vane. This suggests that the entire carbon freezing facility is within the top of this thin vane. To me that seems both impractical from an engineering perspective and not believable visually. The carbon freezing chamber should be inside the city, not the vane. I would suggest moving the window and the balcony farther down on the vane so that they're both at a parallel level with the support arm which attaches the vane to the interior wall. The lighted tubular tunnel, that Luke walks through before he confronts Vader in front of the big window inside the vane, could be explained as the inside of that support arm.