To make a quick frame for my raised 4x4 beds, I used 18 inch rebar stakes at the corners. Placed 2 10 foot pvc plastic pipe over the rebar diagonally so that they cross in the middle of the bed. Tied the pipes together with fishing line.
Cover with net and fasten however you want. I have lots of split wood, so I just used a bunch of logs to anchor the net down.
Thanks for that info!