The material used for the perimeter wall of the platform outside the Shelter consists of large rocks. Chen Zhou plans to build it up to 1.8m in height, with a width of about 1m.
Inside the semicircular wall, he plans to build four wooden watchtowers, each 3m high, to observe the situation outside the wall. If necessary, a few lamps can be hung at the top of the watchtower to provide lighting.
The foundation of the stone wall needs to be deep enough to support this heavy structure.
In the past, the side of the platform easily collapsed during the rainy season, eroding the soil. Therefore, it also needs to be covered with a layer of rock, and when laying the rock on the slope, it should be built steep enough to make it difficult to climb.
On the east side of the cave near the storage room, Chen Zhou left an opening in the stone wall to install a gate, with a stone staircase leading outside from the entrance.
