Are all of the items accessible in the game right away?

Not all ships and vehicles we sell are flyable right now and instead you will receive a loaner ship or multiple ships in-game until the work on that ship or vehicle is completed. You can check the exact loaner ships here: Loaner Ship Matrix

When it comes to other items like legacy paints or old equipment items, those might also be not in the game yet and will be added at a later date by CIG.