Holy moly!
I thought the letter was fine (very thorough, too) until I got to #5. Looks like he got kinda carried away there.

I know that you did the mature thing and replied that you will discuss everything in mediation, but I would probably, left to my own devices, draft an almost identical letter turning the tables. The part that really eats me is how he is dictating how you should conduct yourself as a mother. I would find it SOOOOOO hard not to rewrite the entire thing saying "I expect you to blah blah blah), putting it right back on him so he can see how condescending it is.

But you took the higher road. Brava. I wish you luck - he's a smart guy, but then again, you're smart AND tough AND beautiful. So you have a leg up on him!