I think it's probably a bit too soon to be either overly pessimistic or overly optimistic, based on what's been shown in those pictures.
Six weeks should be more than enough to wrap up the themeing work and get the scaffolding down, so I wouldn't be too worried from that point of view. But obviously the big unknown is how the testing is going. That'll be the key deciding factor in whether it opens for the 16th March.
They clearly are aiming for the start of the season, but they look to be hedging their bets, as the construction walls have been left up at the Air end of the site.