I hope his name is Jebediah
I don't see why there is any pessimism on this one, it's blind easy.
Not to intimidate anyone with all my Kerbal Space Program expertise, but doing a flyby of the moon is a lot easier than a rendezvous with the ISS, from an orbital mechanics perspective. The big different is it takes a lot more Delta V (fuel) for the moon and they have a big falcon rocket that in fact has lots more fuel.
If they can launch a Falcon Heavy, and if they can send a Dragon 2 to the ISS, then they are done, existing hardware on a slightly different course! If they can reuse everything but the second stage (or is it called third stage in FH configuration?) this might even be easy money!
Still a massive prestige move and will make them (rightly!) look like the world leader in space. No one else can send people to the moon with no new hardware.