Son got this for his 12th birthday and loved it. It took him 4 or 5 hours to assemble. He has done small architectural sets and recently the Guggenheim, but this was his largest set to date. It wasn't too difficult for him. The only thing that was a problem was the very first step, assembling the base plate, which he had some trouble with. He says it took him 15 minutes to figure it out, but he wasn't upset, and he wasn't very upset. He had a great time with this set and is very proud of the result. An incredible sense of achievement.
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