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The ceiling is very simple, light steel keel, connectors, gypsum board. Or change to different materials such as aluminum gussets, the principle is the same. In addition, there are some decorative plaster angles or solid wood moldings. There may also be light strips installed in the ceiling.
The section is different from the elevation and floor plan, and it is simply understood that it is like eating moon cakes, and after cutting it horizontally with a knife, you can horizontally observe what is wrapped in the "filling" inside"This stuffing is what you need to understand.
Intercept key parts to make section elevation drawings, and complex structures to make node sketches.
As long as you master the CAD software, you can understand the cross-section, and you can draw it according to the actual size.
Something like this, you draw it according to the height of your design, and you add the downlights.