How did taking the position of an Extreme User influence your thinking in relation to the design challenge? Was it different to how you usually generate ideas and empathy?

It is quite a challenge that mix up two different elements (phone booth and romantic), What I tried to do is not only make the phone booth feel romance from the "exterior" but tried to make it romantic from the "interior" as well. It means not only using decoration on the phone booth but the user will feel romantic when they use it.

Did any of the other design thinking techniques (design provocation cards, stories, storyboards, etc.) help you to work through ideas and collaborate with your group members?

Yes, the provocation cards is helpful to generate new ideas. The team members also help each to think differently.