He will call you and tell you that you need flowers for a diy, since you cant get them, he send you the diy.If he does that after you set the houses up, then no. (If he does it before then, I can't recall, as I'm coming back to the game after a long while away...) If you mean inclines, though, I do have those unlocked. The game did prompt me with a dialogue box telling me that I'd finished setting up the houses, so it's some flag directly affecting Nook that hasn't triggered it seems like.
Then you can pick up flowers, make the diy and deliver all items, once everything its done, some villagers will start moving.
1 day slot sold, next day arrives