I had the box about 2ft away from the tip of the cue.
And yes, when a player has a good consistent stroke then all they have to do is alogn that stroke to where the cb needs to be in order to pocket the ob. But, believe it or not, that part of the game is not automatic simply because you have excellent stroke mechanics.
Recognizing exactly where the cb needs to be is an entirely different skill, separate from stroke mechanics, and it traditional requires a lot of trial and error, a lot of guesswork and repetition. And once you begin repeating successful shots more often than unsuccessful shots, you finally begin to start paving those neural pathways in the brain that are needed for accurate and consistent aiming skills.
Many snooker players develop their aiming skills using fractional aiming. It's a very simple way to visualize an aim line. Anyway, generally speaking, aiming a shot has nothing to do with playing position. I mean, playing position doesn't lead to good aiming skills -- it's the other way around: Developing accurate and consistent aiming skills leads to more accurate and consistent position play.