Okay. I have got an idea and I know you are not allowed to affect the LU economy so I will try not to in my idea. It shall be in Parts.
<Han Nibble's Part>
When you go to Moonbase, Han Nibble is gone and replaced by a Guard (I haven't got a name yet and he will give you the missions that Moonbase originally had). This Guard is a Moonbase Guard and says the Research Center has been repaired, so you can go there. You just need to go through the Big Blue Door which should be opened. The tunnel could open up into a huge cavern, with multiple levels. A guy possibly named Hal Per (Helper, and also reference to HAL possibly) tells you to go check in with Han Nibble, who is at the Core Research Center. He says he wants 10 more Power Cores and return he will give you Hover Wheels (Possibly Wheels on their sides for your Modular Car that radiates Imagination from the bottom half) and they are found at the MoonTerminal (A big area near the roof of the cave with a huge spaceship that points into space through a hole in the cave roof) and they are found in blue crates, much like they originally were. Then you go back to Han who tells you he needs Moon Rocks to power his special Core machine. They can be found by going to the Rover Racetrack (A new racetrack?) and racing. On the racetrack there could be glowing rocks and you drive into them to collect them and they provide some Imagination for the car's boost meter. Then you go back to Han and he gives you MoonCoins, which are like Faction Tokens and are stored in your Backpack. Han Nibble will let you repeat this mission.
<MoonCoins>
These could be the currency of Moonbase or, if the other LUPs wanted to use currency in their worlds, they could be changed to LUP Coins. They could be gained by smashing blue crates or racing at the Rover Racetrack and could be spent on on Car Modules, the Rocket Modules or Moonbase Models, exclusive to Moonbase, at their respective Vendors.
<Rover Racetrack>
This is an area with a girl named Satel Iyte who is a Racing Vendor and a Racetrack entrance. The Racetrack would possibly be with a dead end with a ramp that lead into a portal, that transports you back to the starting line. There could be lots of natural ramps, and possibly reduced gravity, like the real Moonbase.
<MoonTerminal>
This could be a place with a guy named Ro Kett who is a model vendor (He also sells the Moonbase rocket parts). There could be another guy named Ell Yupea (LUP) who tells you that you could mail a model to the A-Team's Minifigs who could maybe copy it and see if it was good enough to sell here. There is also a huge spaceship they are building to go to the Piratron Planet (possibly added later).
<Grabble Grove>
A small spawning place with Grabbles. There are Grabble trees that must be destroyed, or Grabbles will grow and attack! There could be several different Grabbles, listed here:
Grabble: Just a normal Grabble. Does it have 2 health? I think so.
Grown Grabble (Survival Exclusive): A bigger Grabble that has Three health and is stronger than a normal Grabble.
Glare Grabble: A slightly bigger Grabble that is red and has 5 health. When it is nearly smashed it emits a flaming charge, causing 3 damage. Normally it can spit a small ember that causes 2 damage.
Giga Grabble: A huge Grabble that are spawned when Grabble Trees are destroyed. It has 10 health. It can attack by biting which causes 1 damage, but could be followed up by a pounce by the Grabble, causing 2 damage. It can also use a Grabble Spit attack, launching a small projectile that causes 1 damage and knocks back the target.
There could also be the Grabble Grotto, a survival/Dragon Battle type minigame that could be a small ring with three small pathways on the opposite side of the ring, where Grabbles appear. There could be levels, and every three levels a Grabble Growth could occur and the next in the Grabble line shown above, which spawn rate would increase after each level.
That is pretty much it...but I have ideas for another area. Thanks for reading.