Allen was renowned for his skill at scratch-building and creating scenery, and he pioneered the technique of weathering his models to make them look old and more realistic.
Allen was renowned for his skill at building from scratch. 
( z1 renown :ARG1 ( z2 person :name ( z3 name :op "Allen" ) ) :ARG2 ( z4 skill :topic ( z5 build :ARG0 z2 :manner ( z6 scratch :ARG0 z2 ) ) :poss z2 ) )