Really, really amazing.
I just made him a TShirt at Zazzle. On the front is that picture with the words "Lego Master!!" above it, and on the back:
1 six year old boy
1 completed Ultimate
We went out last night for ice cream and donuts at the Farmers Market. He had 2 donuts and 2 scoops of ice cream. I think the sugar crash gave him nightmares at around 11:30.
This morning, he woke up saying "I didn't finish it!"
And now, he is having regrets. He said this morning that he still wanted to work on it, and he's sorry it's over.