This is probably a two seater, (like the SolarWorld GT car) and they fit in the front where the floor is lowest to the ground.
For those of you on Facebook, there are a lot of construction pictures on their page:
https://www.facebook.com/UNSWSunswift
Edit: here's the floor pan under construction - it appears that the batteries will be in the central tunnel, and the footwells for the two people do look a bit narrow:
Here's the solid model of the chassis: