During 2020, I have spent a lot of time in Tinkercad designing 3D buildings and other items to go with the buildings. Here is probably my final design for 2020, my version of Santa’s Workshop. I created the flooring first, then the decorating inside the building. Afterwards, I created the walls, windows, doors and finally the outside décor.
Yes, I made the elves, stockings, and presents too. You can view the 3D design on Tinkercad: https://www.tinkercad.com/things/hH70mNuXMGZ