It's an impressive animation, and the starting point of stacked blocks is good, but I'm not seeing 'Lego' (fun, play, whimsy, children, colour, change, adaptability) within the building itself. Instead it looks like any other (exquisitely designed) contemporary art gallery - stark, empty and white. Not a place that elicits joy and playfulness; I can't see kids having fun here.
(Speaking as an admirer of Ingel's other projects, at least in their conceptual form: I've yet to see how one actually performs when constructed. His concepts are always big and ambitious)
PS 'Lego' isn't an acronym. I don't know why people think it has to be capitalized.