I think the OP was talking about using fake plants rather than live ones, so no watering system needed.
IIRC, Lush Camp was a moop disaster, and the cause of the no-live-plants policy. If you must have live plants, keep them inside and contained.
I did succesfully build an indoor oasis in a geodesic dome (got approved before the no-plants policy), but it didn't have that many plants in it. Plants are difficult to ship in quantity.
If the dome is decently sealed, with a plastic floor, the moop is nicely contained.