This is kind of against the rules but because you had a big disadvantage of being leaderless for so long time, and have 24 hours to finish the Vault, I will give you a couple of tips.
You need to start building the Vault
right now. No discussion at this point, just start taking cards asap.
- identify the "best" Air cards
- take 18 copies of each of these "best" cards
- take a big pile of Air Pillars
That's a great start. Next you need to:
- identify the "best" cards from other elements
- take 6 copies of each of these "best" cards
- take Pillars based on how many cards you took
This will give you a good beta Vault that you can then customize if you have time.
You probably knew all of this but I said it anyways.
Btw.. there is a small change of extra 24 time to build the Vault. More about that later.