Stackable 300 Block Range TNT Cannon

I was thinking of a TNT cannon design, and it began to look like a wall of destruction. As 1 of these cannons was not enough for me, I spent a little bit more time, devising a way to make it INFINITELY stackable.

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Learn how to build it here:
http://youtu.be/x6aSq6FB7Qg

*FIXED: Random items from previous explosions removed.

NOTE:
Due to the immense amount of TNT being fired, I would be careful stacking more than 3-4 rows, as the lag may disrupt the explosion and cause problems (BIG problems.)

Additional Notes