I wouldn't want to be a child to some of you. God forbit you not understand the granular structure of pine and how it effects strength or the bearing force of a roller skate wheel on your soap box derby car, you'd obviously kill yourself.
There is such a thing as learning as you go, making mistakes and fixing them etc. And god forbid his gun not be the height of perfection in your eyes when he is done.
Maybe if you dont have something constructive to say you should just leave it alone rather than being sticks in the mud.