Its a good sign for wfp that the sites are moving away from scafflod etc but its us that have to solve the probs, I would honestly think of a figure and double it, if they dont accept it- walk away. But its the challenge aint it. Take care, hope you get it right though, not many of us do. They usually want to screw you and want the room to double your price to make a profit and pass it on to the client.