Massive billboard: great idea! Weak message: This image of WTC7 with "Never Forget" just sounds like another memorial sign. Most people won't even recognize it as WTC7 instead of one of the twin towers and they certainly don't know a) that it wasn't hit by a plane or b) it fell at free fall speed.
A suggestion. Divide the board with a bold line. Two images and text: "BEFORE" and "AFTER". Text underneath: WTC 7 WAS NOT HIT BY A PLANE.
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