Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
The usual answer is that MS created the all white one for repainters to play with (which is why all the default AC have a plain white version) but of course that causes problems when you try to paint as you lose the panel lines and rivets.
It would be great to have a 'proper' layered paintkit for the Goose.