just musing, were the attachment arrangements postulated as being similar to the Mayo/Mercury composite or something more akin to that used on the German Mistel.
many years ago i made a model of the Liberator/Hurricane composite based upon the 'Hurricane Special' artwork but i remain unsure as to the veracity of the depicted illustration ?
ref. 'Hurricane Special', Maurice Allward (artwork by M. Roffe), Ian Allan Ltd., 1975