Hey If You Watch Minecraft Builds On Youtube Then May Many Times You Make It Wrong
So This Things Will Help You Build Them Always Correctly

First Make Sure You Have World Which Contains The Build
Mostly Youtubers Give Link To Thier World

And Then Ezly Download This Mod

Then You Will Want To Search Youtube For How To Use This Mod And Then You Can Make Holograms Of Build Even In Server

Note:
I Have Not Created This Mod This Mod Is Created By Masdy