I tend to draw some sketches and write a couple measurements for overall size then make up the rest as I go.
Same here, someone else's plan is mostly a reference.
Interesting, one of my future projects will be a gun case of an old black powder rifle that was passed down to me from my grandfather. Have a real cow horn powder horn and all. I thought about making the long sides hold the ends and the cradle parts inside hold the long sides together which in turn hold the ends, etc. I like the rope hinge idea too, why not make the latch out of rope also, just attach to the lid and feed through a hole in the side for the handle so when you pick it up it holds closed.
What kind of wood, I haven't decided what would be light weight enough, the rifle I want to carry is heavy enough already