Here are some of my trial shots
The light was midday sun, and more than a bit harsh, but I did what I could.
My personal favourite:

I would have liked greater separation here to get the shadows on the ground rather than on the chairs

The sun went behind a cloud for a moment. Hooray!

One of the few showing al the chairs. I used a pair of SB800s for fill in, but their light was simply swallowed in the glare.

Any suggestions, comments welcome.
I should be able to have another attempt next week with all the chairs. a some of the students were away for this shoot, and we will try again for the lot.