On my website I show how to hook up the Benedini to the Clark board.
Re transmitter stick mapping. I personally think the factory Clark set up is a dogs breakfast, but you can move the servo cables around and get it to what make more sense. I have my Clark board set up like a HL. Speed and direction on the right stick, turret and cannon on the left.
You have to change the parameter setting on the TBS, and know a little bit about the Benedini., Of course you could send the stuff to me and I would set it up for you.
Cheers
Dan