Two weeks later (today) we finished the project. I spent the Saturday painting the older part of the pergola as the colours weren't quite an exact match.
Today my Dad, Mum and Mike's Dad all came over and we finished putting the roofing on. We brought some doubled sided cream corrugated sheeting from Stratco. We had an existing semi clear sheeting on the existing part, but that stuff actually adds 8 degrees to an area. However we did want to add in some natural light, so we interspersed the cream sheeting with the clear.
The end product looks AWESOME! All up it only cost $1500 so it came in within budget!!