Still too soon to tell for sure either way.
If this was built up to the Hanger Deck, the supporting structure for the elevators would be seen...and I do not see them. But that does not mean it is built up that high yet.
At present I think the highest point of the carrier is maybe a deck or two below the actual hangar deck, at least. i.e.: once they seal up the open compartments that they're working on there will probably be a few additional decks above it before they actually build the hangar deck itself.
Also, we should recall that we may not see the supporting structure for the elevators very well; the elevators will probably be on the starboard side of the ship, and most of our pictures are looking towards the port side, so we will likely only get pictures of the elevators and the supporting structures of the elevator once they are well into construction.
The supporting structures for the elevators are also probably going to be relatively late additions in the ship's construction schedule; chances are we will see the "walls" of the hangar come up first before we see the side additional elevator structures on the side of the hull, like below for ford class:
or for a cvf module:
So, based on this, I propose another way of positively identifying the ship as a carrier -- after the open compartments are sealed up and after construction reaches the hangar deck level, we will start to see "walls" coming up on the side's of the ship to create a "hangar," that would be very strong indication that this is a CV.
(Of course, a hangar could also suggest it is an LHA, but really we have no rumours to suggest the ship at DL is an LHA, so while it may be academically useful to consider that suggestion there is no practical reason for us to give it any credence)
In addition, I do still see the large open/vacant areas in the center, which still tends to have me lean away from a carrier.
Like it's been said, the openings/compartments are probably because they're still doing work there. I expect that if this ship is a carrier, then in time the openings will be sealed up and they will continue building the ship "upwards".
If the opening compartments are never sealed up and the ship is launched open, then that would suggest that this thing isn't a carrier.
I feel like pointing out the openings/compartments in the ship at present is not a very useful point of support or contention regarding whether the hull is a carrier or not, because there is no reason why such open compartments can not exist in a carrier's construction at this stage.