The new layout. I'd just cleaned the cage when I took this pic. The floral fabric hanging down is a pillow case I used to hide the litter tray (since it's not very nice to look at lol).
They haven't fallen off so far, and it looks a lot steeper than it actually is. And as for moving the couch, they have enough room to walk by it. But most of the time they climb onto it and get by that way.