I don't think the grass matts here would work for me, personally. I believe the boyfriend is allergic to them.
I'm excited to use the cork, it looks very nice in all the cages I've seen
The bendy bridge isn't being separated for the wheel, it's being used to separate different substrates. That other area is going to be filled with sand. I did tweak it slightly though, which you will see when I picture-update the other thread!