It is indeed just for the base box. Some of the wave 2 components fit but for those that don't I'm storing in the Vastaryous' Lair box. I'll also reiterate that it is only for the Kickstarter edition as some poor soul discovered when he followed my plans with the retail version and it didn't fit. I don't currently have any plans to expand on the insert.
how did not fit with the retail version? Did not fit all the pieces or left a lot of empty space?