I like what you are doing here but pause a bit and review it, put a friend's eyes on it, also, I think you are confusing the comic book and presentation slide format. You want the comic book, and that also lets you do long and wide boxes for things that deserve the extra room.
Last Slide/Picture:
Input: 2+7+2 (11)
Output: 2+2+2+2+2+2+2(14)
Furthermore Alice, Bob and Charlie likes to get the the same amount out as they put in.
If Bob put 7 BTC in, than he needs to get out 7 BTC - 2 BTC junks for each of them does not work out.
Output: 2+2+2+2+2+2+2(14)