Two bamboo stakes with a slotted end to support my chicken wire 'dome', providing clearance for a future roosting bar over the cave. The open end shown is closed off using another piece of cardboard and the ever-handy paper clips keep both ends securely in place.
Bamboo stakes also support the side edges of the draped chicken wire where the spring tension of having been tightly coiled keeps it snug against the sides of the crate. No fasteners required.