This mod is "Free for all" as laid out by the PZ Modding terms: https://theindiestone.com/forums/index.php?/topic/2530-mod-permissions/&do=findComment&comment=36476
File credits
Onkeen created the awesome preview image!
Donation Points system
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Obey gravity. It's the law. This mod lets structures come crashing down when their support structures are removed. All structures must have a wall in a 5x5 area below or get destroyed. Also prevents players from building floors more than 3 tiles away from any wall.