Large Effective Sandstone Wall

This is a project I made in about 15 mins maybe. It's a sandstone and sand wall thats 4 blocks deep and in my opinion would be very effective in a PvP situation. This wall would put gravity on your side, because even if the enemy were to detonate TnT on your wall, sand would fall in the exploded areas and refill it. This provides a nice safety against those loser one TnT attackers. You could even implement a lava moat, lava trap or piston door for better defenses. I hope I gave the faction leaders a nice idea :D