If you get all 3 faerie chests every day of the event you should (normally) be able to craft all 3 Faerie Atrium prizes.
The last prize (Van Pelt) requires 70 of the golden faeries. To collect those, you need almost the entire 14 days.
In the mean while, you can get the other 2 crafts (tree + bat). But you have to craft them when you have the required faeries, not save them all up.
If you save everything up and start crafting stuff at the end, you can only craft 1 of the 3, because you'll run out of the easy to get faeries.(purple, green and blue)
If you craft the Tree or Bat and then the other one ones you have the faeries needed, you will have enough for the final craft ones you finally have all the golden faeries.
I hope this makes sense,..