This is a set of video's of the demo's that can be...
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This construct 3 demonstration shows how to prevent overlap while dragging. Get the template here : howtoconstructdemos.com/prevent-from-overlapping-another-object-while-dragging-c3p
Contact me on Fiverr if you want further assistance :
https://www.fiverr.com/bartalluyn/assist-you-in-creating-your-construct-3-project