I had this on mine:
What I should have also done is have a couple of plates sitting near the ends of the crossmember (where the hole on the top is) then weld a bar down to it. That way when you offer the new floor up, it will but up against those plates and you know its the right height.
Don't remove the door steps until the floor is back in! remove the sills and grid down the flange so its just eh door step/rear quarter left, as that gives you another point to clamp up the floor to.
Make sure you buy the full injection floor! (yes its expensive)
I also gave up trying to separate the companion bins and ended up buying new...