I know it has been a couple of months since anyone has posted to this thread. I thought I would throw in a couple of ideas I intend to try when I finally get some time. I have collected a couple of those triple and double cement laundry tubs and an old bath tub. People tend to throw them out when renovating old homes that have outdoor/under house laundries. They already have good drainage and some come with the concrete stands, which lift the tubs to a good height (no needs to get down on hands and knees to pick or plant).

Arrange it all in a U-ish shape and throw an arched climbing frame at the entrance. Plants climbing beans or passionfruit at the entrance, throw some cheap gravel or road base down in the middle of the garden and you have yourself a little vege patch retreat.

Well, that's the plan anyway. If I ever get it up and running, I'll try and post some photos. Happy growing!