Time to get your own tools.
He will probably get angry at that too.
But you have a right to build a sandbox if you want to, heck, it was your idea in the first place, right?
See he feels badly about himself if you go and accomplish something for your kids because he will have to look at how he has said he will do these things and hasn't.
The only way he can maintain control that he's the MAN of the household is to keep you to your womanly chores. ha.
It makes you look good and attentive and giving to your children, it makes him look bad for not doing the same.
Here's the question though: Will it be worth the sure fight? The nasty argument?
You probably already know how he will react. Think it through. Then come back here and talk about it. I don't know the man, so I don't know if all hell is going to break loose at my suggestion of you getting your own tools, but I have a feeling....