Really pleased for you mate! Sounds like they're asking a lot for an 'assistant' position though??? I still think it worthwhile to take your pencil sketches along, as it shows artistic ability and the ability to see and record what you see!

Anyway, to make things easier have you thought about doing something architectural but still sculptural? If you need to do a smaller object I'd aim for something you know you'll be able to complete in two days...I don't know if a car is achievable but remember you don't have to model what you won't see! What about a racing bike or a scooter (Vespa?) ?

Anyway, good luck with whatever you do!

J