We know the buildings won't be that tall, so it'll be interesting to see how it actually looks once finished. I also still think that some of the walls, in particular the Airrail Company one, look a bit flat.
Someone has mentioned that the sound barrier walls appear to be much taller than they actually need to be for the coaster (or maybe vice versa, that he expected the coaster to go higher due to how tall the walls are, you get the gist). I think it's a bit deceiving that we have never gotten a shot of anything in Rookburgh from the perspective that it's supposed to be looked at, which is from below. We already know that Rookburgh is going to be one level below Berlin and the entire point of F.L.Y. is to interact with the surroundings and especially fly over the people's heads. When you are looking at something from below at an angle, with nothing visible behind it that would allow for your eyes to adjust the scale properly, it pretty much always appears much taller than it actually is.
Also, as long as there is at least some texture and fine detailing to it, a similar effect applies to the two-dimensional walls. We've only been getting shots from a parallel perspective, from Hotel Matamba for example, and that makes the wall look flat because you're looking at a flat projection. When looked at from below at an angle, all those little details sticking out of the wall will appear much more visible, organic and especially three-dimensional. It's a bit odd considering that Phantasialand has said that Chiapas will be the last project that is just utilizing facades instead of fully-fledged structures, but I assume with the space they had to work with there was no other choice. But then again, that doesn't have to be a bad thing. It's rather an "unfortunate" choice of theme, with Klugheims rockwork, you don't expect it to be massive in all three dimensions because it doesn't matter, while with tall buildings you automatically associate them with the fully three-dimensional structure they are supposed to represent and then it looks odd when that expectation isn't met.