It seems like you have more of a handle on how the arcade machine works than most anyone. I'm not actually sure what those values mean...
But I'm fairly confident that as a player I can get across the gameplay. One of the best resources was actually the old Snes SF2 players guides - a great amount of detail there as to how the combo system works. Final fight has a basic implementation of that.
I guess the hitbox is to do with collision detection and camera is maybe scrolling?
I was using a 'hitbox' (rectshit in blitz) in the early stages but it proved very slow for multiple characters. I found that 'proximity detection' was much faster and does basically the same thing.