The reason for it is because of brick count. We want to try and start with as low of a brick count as we can get while still achieving the atmosphere that we want! We have to compromise and put the detail in the parts that get looked at the most and are interacted with more, in this case the walls immediately around you and the ground you're on, not the higher walls and ceiling.
Talking of the building though, it's almost complete; Just the last few finishing touches need to be made! Once that is complete we will finish off the games and start moving them inside.
10 days to go everyone! The day is getting ever closer and we hope that you're all just as excited as we are :D