The working arrangement for the moment (which still goes out the window without signed contract and deposit) is that I will work with 2 models, the other photographer will work with 2 other models. This ought to be good enough to keep us from stepping on each others' toes. But I'm still skeptical of the ability of one of us or both of us to get the volume of shots completed in the time the client thinks they'll be completed - he wants to get the shoot done in 6 hours, photographing 75 items each (150 items total).