Hamburg, there is very little chance you are going to get sole custody of the kids, and doing so would likely not be good for any of you. Please listen to your attorney tomorrow and remember this is the children's mother. If you are correct, she will struggle enough financially and be forced to face her consequences as a result of her own actions, which is the far better just deserts.
I personally have a hard time with someone who describes himself as respectful and humble and says it hurts him to see her suffer and then says he will demolish the mother of his children. I told my H that I would not be the first to launch any harmful blow, that I would only defend myself and the children in response to actions he takes. I've only had to stand up twice and got what was right both times.
I sleep very well at night knowing that I am not adding to my children's pain and wasting our money harming someone who very clearly has major issues. Nothing you do to her will compensate anyone for the pain she has caused, it will simply result in more harm for everyone. In the end you will do what you will do, but it does not have to result in a Pyrrhic victory.