Late last week I drove past the some of the new RRL infrastructure in the greenfield section. The Wyndham Vale station looks complete apart from some minor carpark sealing. There is a security guard, presumably to ensure the station doesn't get tagged. The Tarneit station still has carpark sealing works, and its progress behind that of Wyndham Vale. There won't be much walk-up trade initially, because to the north and south of the station there are wheat fields.
There's some impressive road infrastructure including a long bridge for Armstrong Road across Lollypop Creek, just south of Wyndham Vale station. There are plenty of new road-over-rail grade separations (20 according to the website), some complete with traffic lights. Some of the smooth asphalt hotmix roads on the grade separation join to badly corrugated gravel roads just beyond the project boundary (eg Boundary Road Truganina). In nearly all the road over rail crossings, the road rises over a hump. This is no doubt the cheapest way of grade separation, but only acceptable in greenfield sites. While the project is acknowledged as a rail project at the Federal level and treated differently from road projects for GST distribution purposes, and I understand has caused Victoria to miss out on about a billion dollars of GST income. My guess is that about a quarter of the project budget for this section has gone on the road components, with further road commitments to the Anderson Road grade separations and Main Road St Albans.
I also tried out the Werribee line during the evening peak. There was barely standing room from Southern Cross to Laverton, after which about half the passengers alighted. The next most popular station was Hoppers Crossing, and relatively few passengers were left by Werribee. The new Point Cook station was relatively lightly used relative to Laverton and Hoppers Crossing. Aircraft station appears to be becoming more popular as a park-and-ride station now that Zone 2 doesn't cost any more, with a lot of cars parked on the grass. The peak hour Werribee semi-express services are now offered every 10-12 minutes, and this was in the quiet month of January. Even when RRL opens and takes the Geelong trains, there won't be much spare capacity.