Continuing the discussion from Create Elevation by Rooms:
Started a new thread.
I had to install the most recent version of “Lunch Box for Dynamo” to work in version 1.3
It looks like you have changed some thing from the image. Where you have the yellow node warnings, you have disconnected the inputs into the “Manage.RemoveNulls” nodes. Make sure that the "BoundingBox.Byelements node is connected into them and it should work.
Let me know if it works