We plan to physically separate with me going to the rental 4 days and her 3, the following week we'll go 3for me and 4 for her. That way it gives us a chance to have the weekend for ourselves every other week. I get to pick up my D4 from daycare everyday, so I 'll get to see my girls daily. If it doesn't become too uncomfortable, I can even wait until D4 goes to bed before I leave.
Why?
Why can't you just live at the home and she continues to live at the rental?
In the end, if you guys do end up divorcing, you won't be swapping living locations, it's really an inefficient, childish, immature thing to do, swap living locations - this is being done for what reason?
You are making things to easy on her.
There are consequences for the decisions we make. She has consequences for the decisions she chose to make. Your job isn't to make life easier for her when she makes that decision. You were still committed to her, you didn't want your marriage to end, she did. Making that decision, she has to deal with what happens as a result of that decision.
Think about this before proceeding with the living arrangements swap.