PLOT CONSTRUCTION

I purchased tanalized pine fence palings 150 mm. by 25 (or 30 mm.) and cut them into one and a half (1500 mm.) metre lengths. I butted them around to form a square, nailing with galvanised nails
It was a bit tricky to set the frames in place, to dig them in slightly until the soil came nearly half-way up the inside, to tamp the edges down to keep them firm, to line them up and level each frame. But in the end it worked out well.
The walkways around each plot are well below the soil in the plots and provide good drainage. I placed bark on the walkways. It's good to walk on.
Even if you only get this far you have a neat looking garden, requiring no digging, with ease of operation and the ability to rotate crops.

FRAMEWORK:

How to solve the problem of no spraying took me eighteen months of trials. I erected a framework of PVC piping over each plot and finally tried plastic sheeting which wasn't any good. Then I tried shadecloth but it was the wrong dimensions and too difficult to sew.
Later I found a green windbreak that was three metres wide and when cut square fitted over the framework ideally. A nylon cord threaded around the bottom with the corners tucked in front and back and tied tightly around the centre of the timber kept the slugs and snails out as well as the butterflies.
The frame to hold the netting consists of white PVC pressure pipe 15 mm. in diameter and comes in six metre lengths.
It's best to make three plots at a time as for each plot you require two cross-pieces of two metres each and four uprights of one metre each. For three plots you need four 6-metre lengths of 15 mm. piping from your nearest plumbing supplies. From these you can cut six lengths of two metres and 12 at one metre with nothing left over. Cut the flanges off the end of the piping and reduce the two metre lengths slightly to compensate.
You also require 12-15mm. elbows to join the cross bits on the uprights.
Finally purchase about two metres of 20 mm. pressure piping and cut into twelve 150 mm. lengths (enough for three plots.)
These need to be drilled through halfway down and nailed into each corner so that the uprights can slot in and rest on the nails.
The height of the uprights should be adjusted so that the nylon cord at the bottom of the netting fits snugly and tightly around the outside of the wooden frame about midway up the boards.