It is a bit much, considering our circumstances, but we are planning to do a screen test of one key scene that involves a number of technical challenges.
Our hero does combat with a pair of giants, played by one normal sized actor. We have a size double to play the hero to make the giants look big. We'll do a reverse shot or two in order to show the actual hero actor. It's also against a green screen, and we'll add a snowy background later. I don't want to just make the background white, since the color of snow varies slightly with light and the angle. Then we'll add some snowflakes to tie everything together.
So, yes, a screen test is essential in this case, I think. :)