Jokes on you, because I'm doing it anyway (though it's primarily because I'll be rotating rabbits through the raised beds).
Hardware cloth base (voles, rabbits), concrete corners (pictured) with 5'x1/2" rebar stakes, 4'x8' frame made with pressure-treated 6-bys, ~33" tall (6 blocks).
Bent EMT conduit slides over the exposed rebar on the corners and creates the frame for the cage/shade-cloth/bug-net/greenhouse/trellis/irrigation.
