I doubt she's going to go for this but it is a starting point and you should always ask for the max to begin with. That said your proposal feels like a lot of switching for the kids. Transistions are hard so you should try to minimize them. What if the person who had Thurs-Fri got the weekend?
That wouldn't work, only one of them would ever get weekends with the kids?!
Yes it's a lot of switching, that's why I also offered the entire week plan as well.
In the end, do what works best for you and your spouse, make it fair for both of you.