Thanks mate,
I appreciate the reply.
I forgot to mention, I'm sure the photographer will be using a Green-screen (again, no experience with these, so tips appreciated.)
You're right, modelling/planning the shots before as a solid reference point is a must.
Not sure which way it will work, but given I'm meeting the client next week, I'm sure I can begin to dictate what the process should be... so I'll suggest something along the lines of me developing a pretty final model before the photography session, then adjusting as needed based photo-set arrangement.