 The puppet stages used for the filming of Thunderbirds were only one @-@ fifth the size of those used for a standard live @-@ action production , typically measuring 12 by 14 by 3 metres ( 39 @.@ 4 by 45 @.@ 9 by 9 @.@ 8 ft ) in length , width and height . Bob Bell , assisted by Keith Wilson and Grenville <unk> , headed the art department for Series One . During the simultaneous filming of Series Two and Thunderbirds Are Go in 1966 , Bell attended mainly to the film , <unk> set design for the TV series to Wilson . 
