[FReepaholic]

>>...Peering over the edge of the cargo bay...<<

Technically, it would be peering over the edge of the open payload bay door.

[DoughtyOne]

If the astronaut were to exit the crew cabin, turn right and go over the side in front of the open payload bay door, he could see the leading edge of the wing without coming near the brittle tiles. That would seem to be within the limits of the teather. I don't know how long it is, but it must give some traveling distance or it wouldn't be worth the bother.