Raised Garden Bed made from Treated Pine Sleepers.

 
Obtain 9 Treated Pine Sleepers 2.4m 200x50.  Cut 3 in half and then saw into even lengths so that you have 6 at about 2.4m and 6 at about 1.2m.  Make sure the sleepers are stacked level during this time as they tend to warp e.g. don't leave them leaning against a wall.

 
Paint the sleepers Brunswick Green - no other colour is suitable!  Apply two coats especially on the ends.  This will seal the nasties in.   See CSIRO fact sheet (page 3 of 7) on the safety of CCA timber in vegie garden beds.

 
Make a level base with two lengths of sawn timber.  Lie out two sides and two ends and, using a level and a square, tack the corners using the Rigid Tie Angle Brackets.  These gizmos will pull everything into shape.  That's the top done so turn it over and build upwards.

 
After drilling guides holes, nail the ends with three 75mm bullet head galvanised nails preferably on a slight angle.  Fix some angle brackets using only galvanised flat heads.  Of course, this would be much stronger if bolted.

 
With everything nailed up you could use filler to seal any cracks or holes.  This will improve the appearance and may exclude dampness especially at the ends of the sleepers.  Cut a length of hardwood 100x50 to fit the inside width and skew nail it in place.

 
Nail the connector plates to the sides and ends using galvanised flat heads.  Place them on a 45 degree angle to give added strength.  Now give everything a touch up with the Brunswick Green without stinting.

 
Cut the polythene film so that you have two 1m wide lengths.  Fold over by about 100mm and position as shown at left.  Using the Moulding Cover hide the fold and nail.  Use gaffer tape to join the ends.