You are sure right about this being a sizeable project, if all the unknown and new items we have seen on camera are for the same project this one will be the biggest project I've ever seen them do.
If not all for the same project, then I must assume they have a number of projects going on.
I am quite sure the 3 or 4 platforms at DDI North are going to be mud sleds of some sort. The type of steel being used and the air bubble holes in the deck steel kind of give that one away.