Its been a while since I watched that episode, but that was built with a steel superstructure surrounded by lego right? The lego was only partially load-bearing?
Around 23:30 you can see that they added a wooden safety structure, which did not (normally) hold any weight. It was just there in case the Lego failed. The Lego alone actually held itself, and the occupants, just fine. The first test is at 40:30.
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If you're curious about the engineering that goes into a large Lego structure, James May ("Captain Slow" of Top Gear fame) built an entire house out of Legos. http://www.youtube.com/watch?v=qR2YqMrS_pM It's an hour long story, but if you want to skip to the final product: http://www.youtube.com/watch?v=qR2YqMrS_pM#t=2600s
Its been a while since I watched that episode, but that was built with a steel superstructure surrounded by lego right? The lego was only partially load-bearing?
Around 23:30 you can see that they added a wooden safety structure, which did not (normally) hold any weight. It was just there in case the Lego failed. The Lego alone actually held itself, and the occupants, just fine. The first test is at 40:30.
Thank you that was a great episode, the only thing I would have wished they showed more of was how they finally got the Lego structure to hold.