Also my Mum's friend, Alison is an architect like my Grandpa. A few days ago my Mum told me I could be a good architect because of my very good Lego and Minecraft skills. Alison used Lego at her architecture school to make model houses.
It's important to scale everything correctly because when people start building it, they need to make sure everything fits in the room correctly.
I was surprised by how complicated it was to use the ruler thing architects use, but I found the whole thing exciting to do.