It seems like you are able to build walls that go through eachother. Using this feature, I was able to build a wall, and then build 5 more walls over the exact same spot, meaning I had a wall that was really 6 walls. If this can be repeated an infinite amount of times, imagine how easy it would be to make a wall around your base that would take hours to penetrate. Just wondering if this is working as intended, or if it will be fixed.
If it won't be fixed, I'll sure have some fun with this in multiplayer, as it will cause my opponents lots of frustration.