I have only made a couple of these but they are so easy to make. I believe this is a Geoff Hamiltion invention. It chiefly relies on layering lengths of 2" x 2" treated wood to the desired shape and size.
The only materials you need are lengths of 2" x 2" treated wood, lengths of 4" x 1" treated wood, some 3" galvanised screws, some galvanised staples, some some visqueen. The amounts of these depend on the size of trough you are making. The only tools you need are a drill, a saw and screwdriver.
For a 6ft (length) x 3ft (width) trough:
1. Do the base - cut 2no. 6ft lengths of 2" x 2" and 2no. 2ft 8in. lengths of 2" x 2" and screw together in a rectangle (drill a pilot hole for these and all other screw holes)
2. Do the bottom - screw cut lengths of 4" x 1" to the base
3. Do the first side layer - screw 2no. 5ft 8in. lengths of 2" x 2" and 2no. 3ft lengths of 2" x 2" to the bottom 4. Do the second side layer - screw 2no. 6ft lengths of 2" x 2" and 2no. 2ft 8in. lengths of 2" x 2" to the previous layer
5. Do the third side layer - screw 2no. 5ft 8in. lengths of 2" x 2" and 2no. 3ft lengths of 2" x 2" to the previous layer
6. Finish the layers except for the last one - repeat stages 4 & 5 until the desired height is
almost reached
7. Fix visqueen - cut to size and manipulate to act as a lining for tough and fix using the galvanised staples hammered into the wood - make sure the staples are at least flush or slightly recessed
8. Add the top layer
9. Finish in exterior paint or vanish if preferred
10. Drill holes through lining and bottom for drainage
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