Deja Vu+ V2, there is much more work than the structure in a roller coaster. Think of all the cables in it for sensors that are everywhere. And the lift system on Deja Vu will still need to be installed, and I'm sure they will have a few problems to work out when installing the LIMs on V2 (or, if they are already on the track when it's shipped, I'm sure the wiring of those is a big job!) They also have to pour queue lines (about 1 day, but still, it has to be done!), finish construction on the station, and clean up. This is all before they go and test it... over and over and over and over... and test it some more. Remeber, testing isn't only putting the train on the track and running it a few times to see if it "just works." They have to find bugs in the computer system that runs it. Then they still have to get it certified. I doubt they could get that done for them in half a month.
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V2, Deja Vu... how can it be better? Add Viper! Oh, wait. It's already there!