The concept art for the Avengers expansion has so much lens/image distortion, it's hard to tell how big it will be. While the foreground building (Flight Lab) looks huge, I think that's all distortion.
Anyway, I've tried to make sense of the buildings in terms of how they could fit and achieve all the positions/alignments indicated.
I really hope they mitigate the sightline from Cars Land... that's a huge show building behind Luigi's. Maybe they'll extend the rock-work, which would certainly be the "Cadillac option", if you excuse the pun.