We have some aggressive council legislation regarding cats. They cannot be out of the owners property in suburban areas. Time to kitty-proof the back yard/s.
I used 25mm electrical conduit for structure, clothes-line for tethered-framework, bird-netting as a barrier, and a bazillion cable-ties. Electrical crimp connectors were used on the clothes line to terminate cables with a nice ring terminal. Conduit mounting clips were used as hinges on the gate. (cheapest hinges EVER, and work great) All bending and joinery was done with a heat-gun as the molded joiners were disproportionately expensive compared to 4 meters of the conduit itself.
Many photos may not be particularly clear, or tell of the construction very well. It was a labor of obligation rather than love...
Pixel is really happy she can climb the trees without her harness though. :)