eaves, canopy, vizor, hallways
廂 centers on a projecting roof structure that provides shelter: eaves, a canopy, or a covered hallway. The vizor sense is a specific application of that same overhanging cover idea.
廂 combines 广 (building with a roof) with 相, which likely contributes the sound and may suggest a mutual or facing structure, fitting the idea of eaves or a covered passage.
Under the roof 广, the inner 相 (mutual) suggests two sides facing each other, like the eaves of a building meeting or a covered hallway connecting spaces.
For ショウ, picture a show being performed under the eaves of a traditional stage: show -> ショウ, and the canopy shelters the performance.