Summited Brandywine on Saturday, parked at 1200m, snow was consistent from about 1300m onwards. Took a more direct route up to the peak, then took the scrambles route back down. I wouldn't recommend doing this route without the proper gear as it involves ascending a steep snow gully and a glacier crossing.
Yes parked about 500m before the Cabin, you should be able to drive all the way to the cabin in the next week or so. There were 2 groups of sledders in the area on meadows and on the glacier, they left pretty early though, well before we summited.