No, I have no idea of the size.
I've only seen a still on Free Republic.
Where's the launch video and at what point did the insulation break loose?
There is a question in my mind about this. TV is showing a photo just as the shuttle is lifting off the pad with an area circled, yet they are saying 80 seconds after lift-off. There is no way that the gantry would still be in the picture 80 seconds into the launch.
Check this video here. This looks more like 80 seconds into launch.