I'm a bit puzzled by this. Going to the Mun in KSP is dead easy, unless they set a very strict budget. What's the challenge here? They could at least use Realism Overhaul and make it a bit more difficult.
But there’s a catch – you and your team will act as your own aerospace firm who received a “fixed-price” contract to make it to the “mun” and back. Outside of the budget restrictions, you’re free to design and run your program as they see fit.