I have a large garden but its on a slope.Im going split it into 3 terraces each one will have a 3ft(ish) drop.Now im not wanting to lay blocks/bricks as i want to do the work myslef and im no brickie .Anyway would this work=If i concreted some fence posts in every 4 ft and to these fix some 8" x 2" timber.So it would be like a fence but 2" thick.If i then fill it in/level with hard core-rubbel/top soil would this work or would the weight of the soil be too much for it?If this would not work is there another way i could do it.