I begged & pleaded to help my father when he was building his workshop, he helped me lay my first brick, I was 4. What a terrific guy!
As a species we are all inherently born to engineer just like a new bee knows how to fly. One could not say of God (or nature), that He/She is a great; politician, doctor or a manager, but one could definitely say that they are both magnificent engineers!
"The most important attributes for a tool builder?"
Sharp senses, dexterity, practice, adventure, investing in oneself, experience & able to accept being an apprentice through one's entire life.