Finally some further development on our wicked garden beds, the left hand pic is the sand base some what overgrown with grass (see how long it has been!) in the guard rail structure. Next a trench is pressed into the sand and plastic laid over the top. Then really old carpet and ag pipe is laid down. The ag pipe allows the water to seep into the bed to feed the plants!
Bottom left shows rocks over the ag pipe, you can see the end pipes which the water will get poured into. Then soil and next step is to add poo and compost!