You'll need a servo extension for your aileron servo. Probably a 6" futaba extension. You will probably end up needing some parts, such as pushrods, clevises, control horns, etc, depending on what comes with the ARF and if the included stuff is good. You may also need to buy or build a servo tray, again depending on what's in the ARF and if it fits your servos.

You will probably also want a heat gun or iron for getting out wrinkles in the covering. Even if it is perfect out of the box, it will need occasional touch-up's.

Did anybody say a glow plug wrench?