You should extend the wings out side to side by about 35%, and extend the nose of the plane front to back by about the same amount. Of course I can only guesstimate from looking at the screenshots. Hard to really know how much :P
We are not planning on extending the deadline for now. As WarrenM said, the contest is already pretty lengthy and with more than 500 contestants, we can't reasonably extend until everyone is done. Try to get as much as possible done this week and next week end!