I made mine out of chicken wire.  I needed (originally and now, for the temporary enclosure,) a 10 x 10  'ceiling.'  I bought 50 ft (2 1/2 ft high), divided it into 4 equal pieces, wove the pieces together with wire, then connected it to my 'walls' with wire.  If you sew, then you would understand that I "whipstitched" it to the walls.
When the dog fencing was taken down, I cut the wires which connected it and rolled up and stored it (under the canoe!).  When I put the fencing up again, 2 weeks ago, I simply unrolled and re-connected it.  I like the chicken wire because hawks, owls, raccons and (gulp!) cats--my Vet told me they'll scale wire fences to get in--won't go in to eat my birds if they think they are going to be trapped inside.
Should have pics of my temporary quarters up by Monday.  Almost done taking them--I'll upload them on the 18th.