PiAware+RPi 3 image question

FlightAware ADS-B Flight Tracking
2

  1. yes. You can easily support other feeder sites.
    There is a script/build, by Joe, that will configure everything in one go. It takes less than 20 minute to do everything.
    ads-b-flight-tracking-f21/ads-b-feeder-receiver-setup-scripts-t36532.html
    It does use a later, development version of dump1090, however, many of us have used it for a month or two without issues. I have 3 RPIs using it.

  2. 8GB should be fine. Larger is better if you want to do logging or run databases to store the information. You should keep a spare as SD cards generally have more issues than the RPIs themselves.
    Just be sure to expand the file system. This allows the internal SD systems to spread the load over the entire card.