In this world, you have a 15x15x15 area to build anything you want using blocks on the side of the area. After you build what you want, By pressing the buttons labelled "Begin Building" and "Finish Building", whatever you built will be recreated on a 1:16 scale. By pressing the other buttons labelled "Reset Small" and "Reset Large", you can remove one of the creations respectively. This World must be played on 1.15, 1.15.1 or 1.15.2.
The option to make one of your creations larger allows for a user to get different perspectives, or use the blocks as a base for a more complicated creation.
The data pack is not completely optimised, so it can be laggy when loading the structures, so wait for a message in chat to be sent.
Feel free to use this for anything you want.