How about adding a command in Just Build where the game enables you to break the floor? It can be a neat feature for situations like building a path, bodies-of-water-related builds, or giving a pattern to your floor.
Pretty good idea 
This is a duplicate suggestion!
Placing Blocks in the Floor - Suggestions / Just Build - The Hive Forums (playhive.com)
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Oh, my bad. Thanks for the welcome though. 
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Don’t worry about it!
And no problem 
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Duplicate suggestion.