Basically to get the 'body' of the walls i used just sterofoam cut up in the shape i wnated to. then I laid down foamboard ontop of it to get a good rectangular shape that wasnt bumpy. I then used a glueguna nd attatched all those bricks on the wall. The pallisides were also made out of foam.
As I understand from the extended edition special features, that character was supposed to be Beregond but the part ended up so minor that it did the character no justice at all and so they just made up a name for him. So in the end, hes neither.