Chief,

Before you destroy your wing, WATER is your friend. Get it soaked, bend into the right shape, and let it dry. You might want to wait until the weather outside is nicer so you can let it sit out in the sun for a while to dry. Once you cover and shrink it, the humidity will be pretty much constant inside the wing and it won't change shape.

The other option is to just build a new panel. It might be a lot less discouraging compared to destroying your handiwork.

Andy