My Dad grew up during the Great Depression–hard times with little money. Whatever you needed or wanted, you either grew, as in a garden; tended, as with chickens (for the family table); made (as a boat for being on the river), improvised or did without.
God-given talent plus those hard times plus later training in various construction skills gave my father ability to improvise or make whatever he wanted. If he needed, say, a worktable or a trailer, he could figure it out in his head how he wanted to do it and what kind and size of materials to use. Sometimes he sketched it out, but he didn’t really need to.