Jack Black was better to play Welles!
Black looks more similar to Orson than Houston:
http://newsimg.bbc.co.uk/media/images/41046000/jpg/_41046538_kong_jack_black416.jpg
Orson Welles:
http://www.rtve.es/informa/tveinforma/historico/23-12-02/images/fotostematicos/Orson_Welles.jpg
Only forget about the hat!!!