Why not use the old wooden steck fort pieces , wont these look good for Asian defences or wooden logs is not historically accurate. I have some low height wooden fences with small width wood i bought a coupls of these from Playmobil Hellas Accessories list last year to use in my mediaval set up , they are not very tal but would look good for temporary defences perhaps.... Or you can always use steck and build the famous Great Wall of China !!!!
...do tell me if something crosses your minds!
. . . there's another type of wooden defence I'm searching for. please see below....(I cant imagine how the ones in the 3rd and 4th picture can help other than thwarting horses and pikemen(in case the enemy comes up with arrows and arquebusiers)