WALL!

2 x 8 x 0m3 (thats 6 by 24 by 1 foot thick!) sturdy steel and concrete wall sections :) High and low LI (2 and 1 unlinked, ymmv with link and scale)

Now you can quickly and easily secure any border at minimum (prim) cost - less than 500 LI a kilometre (800/mile probably I have not used old fashioned lengths since primary school)

32 m and 12 x 12 m corner examples included. Texture and normal map inc for reference

Warning - changing from convex hull may invoke hidden price hike simulation - just like the real thing

Warning - not proof against tunnels or ladders.