How to create a cube in 2d view and scale it based on a point/anchor? Than visualize the cube in 3d.

I want to create a cube/wall in 2d view and change its scale from one side based on a pivot or anchor, after that see the cube in 3d view. Here is a youtube link/example of what I want to achieve: https://www.youtube.com/watch?v=53bWbujdBl8 basically taking a room shape and manipulate its scale than view in 3d. The live demo is available here: https://visualizer.somanyceramics.com/