I'm going to try to play with some green screen a bit this weekend to see how much I can cheat it. Maybe using a skinned frame for motion tracking will work, otherwise I will need at least one interactive prop.
paulears – Do you have a link you recommend for learning more about jesmonite? As a 3D artist I haven't had much opportunity to work with much in the way of practical media, so I am hoping to learn some new tricks.
Also, do you (or anyone else here) know where to find large blocks of polystyrene foam? I've had difficulty locating decent resources on that front. I've concidered getting the pour foam (the A+B stuff) but would still need to make a mould to scale, which brings me back to the original problem.
Thanks for all the recommendations so far!
