Here is the girls' floor time. I just used pipe cleaners to tie all the grids together so I can just throw down some fleece and unfold the grids when I want to play.
I did my floor time grids like yours but used zip ties. Makes it easier to set up and take down doesn't it?
Cute setup, but couldn't your girls get hurt if they tried to climb on the grid tunnel? Their legs could get broken. I've seen some people cover them with fleece or coroplast.