The backgrounds, scenery and props is probably the one daunting thing I'm worried about and it's the question I've asked myself many times. I have found equipment and ways to get around it such as green screens but of course it's not going to work every time, so my main goal is create something that at least has all the animation and dialogue that I'd like. Another reason why I'm essentially advertising within the interest of the fanbase.
Oh, and I'll upload the script again here to see if it works.
http://www.mediafire.com/myfiles.php
I have some experience with green screen and it sounds like it would be a good option for the backdrops at least. In fact it would, to a certain extent, emulate the way that the game itself is put together - i.e. with pre-rendered backgrounds and rendered characters. Have you used the technique before? Of course if you had a model that has some green clay in it then you will have problems, but you could just use a different plain colour for the background instead.
That link looks as though it only works if you're logged in to your account.