One thing I've been unable to confirm is what the landing gear arrangement on the F-18L would have looked like - there are two color pictures floating around of Northrop's display model, one with the gears extended and one with them retracted. But you can't see more than the nose gear in the first one since it's from slightly above the plane.
Apparently Northrop had painted up one of the YF-17s as a "CF-18L" while trying to attract Canadian interest - but the Cobra had an entirely different landing gear well arrangement and I don't think the F-18L would be *that* different.
elmayerle mentions using F-15 nose gear, but the front gear bay is set up for that super heavy duty actuator with the extra-long landing gear bay doors. Again, the question is, would they change the whole bay door arrangement for the land-based version? That sounds like overkill to me...
Also, it looks from some of the pictures that the outboard hardpoints are just a third set of the same type. Which makes things a bit easier (have some left over, I think).
My idea right now is for a late-model F-18L in either NATO service (in the Hill scheme like the F-16); USAF service (in either the Hill scheme, overall Gunship Gray, or maybe Have Glass II or V); or Israeli camo. It would basically be an F/A-18C or D (the official Northrop display model was a twin-seater, though some of the other art suggests a single-seater), complete with bird-slicers on the nose and extra chaff/flare buckets under the belly, with the landing gear doors closed up (so I don't have to modify the landing gear...), the wing hinges sanded off, and three sets of regular Hornet hardpoints.
(If I want to be trollish, I'd do just an F/A-18D with no wing fold and extra hardpoints, and paint it up in USMC colors. They don't fly their twin-seaters off of carrier decks anyway, they don't really need the carrier-specific features other than maybe the landing gear that lets them land with heavier loads)...