Intro/Be the Machine-
This lesson can be completed by any age group. Problems may include a struggle with tools such as glue or scissors, along with possible frustration with not being able to come up with an idea. I think the lesson is easy enough to not be altered in my opinion.
Harry the puffball- (K-3rd)
The lesson itself is appropriate for the age group it s meant to be for, but the message will likely go over their heads. I see failure being a probably especially with the kids at the younger side of the age range. Change the way things are phrased, the lesson is telling kids to create a home for the pom pom but also telling them to making it the tallest they can. Maybe adjusting to just making it about distance would be simplier way to get the point across.
Design a Zoo Exhibit-
(3rd-5th)
This lesson seems appropriate for the intended age group. I can imagine failure with confusion what their exhibits are supposed to have. I would maybe change the lesson to ensure it can be done in a timely matter. I know the time I had for lessons was sometimes very limited, and this lesson could definitely drag on.
Hurricane-Proof Structures- (4th-6th)
Honestly I think this lesson is great for any grade above 4th, the expected cut off at 6th grade does not seem needed to me. Failure comes with the lesson focusing on whose structure is the strongest. I personally loved this lesson last summer and so did the kids so I don't see any chances absolutely necessary.