Buen día Aquí en el plano se ven en solo 6 Columnas. Y en la parte de Atrás no se ven Columnas? ¡ Como se Soporta La Estructura en la parte de Atrás?

There are two columns at the back at the corners; two load bearing wall sections at the kitchen and bathroom add support as well.

SI gracias, las medidas de ese proyecto me las podrían facilitar ?

I'm not sure, it would really depend on the particulars of where you are putting this building, what the context is. It's possible the dimensions would be helpful, but also possible they would be inappropriate for your situation, and then be misleading. I would recommend using the "big ideas" of this design, and then adapting them to your unique context.

De acuerdo muchas gracias