Instead of trying to scale SWORD Base to fit into a Mega set, I'd be more interested in sets that just represent some of the outlying spaces, like Farragut Outpost, Airview Base, the gate, the Courtyard, and the garage.
Farragut Outpost
Farragut Outpost I think would have to be scaled down from the whole circular compound seen in game, but if there were alternate build instructions to make it into one of either of the semicircular structures making up Farragut Outpost, or some of the pioneer homestead structures we saw in the level Winter Contingency, I'd consider buying multiple. If it were a set that could be rebuilt into other colonial structures I'd implore Mega Brands to include reach style off-world colonist figures, who's molds could be used for civilians, colonial militiamen, or insurrectionists. If not, then I'd ask that Mega consider reusing some of the pieces and colors of the Farragut Station set to make set(s) of Reach style Homesteads, complete with Reach style Homesteaders.
Airview Base
Airview Base could probably just be one of the blockhouses alongside the UNSC AA turret, with the Covenant AA cannons already being in this set
https://www.megaconstrux.com/en-us/halo ... rcraft-gun (which will hopefully be rereleased at some point.)
Blast Doors
The SWORD Base gate would have to include atleast one but preferably both of the moveable angled blast doors, lots of silvery whitish-gray bricks for those that want to use them to build the SWORD Base tower, a target locator, and probably a wraith.
Courtyard
The courtyard should include lots of similarly colored bricks the above gate. The courtyard itself should be somewhat elevated, with ramps (though not necessarily as large as the ramps seen in-game) leading down to where the gate and garage would be. The courtyard should be flanked by elevated walkways, with a bridge connecting them, but beyond that I'd probably be fine with simplifications to the walkways. The Courtyard should have some barricades –like in the SWORD Base Invasion set, (
https://www.megaconstrux.com/en-us/halo ... e-invasion,) which would compliment this set nicely– some crates, and possibly a cart or forklift.
Garage
The garage should have the elevator, a pair of Hunters, some civilian cars, and a rack of shotguns behind a pillar.
SWORD Base
The actual tower of SWORD Base, and all the verticality and interconnected rooms of it's interior, IMO just wouldn't scale very well, but if you twisted my arm, I'd say that instead of focusing on capturing all that complexity in one scaled down set, the set should have instructions on how it can be built into different sections of SWORD Base's interior, and those who want to capture the full complexity can get duplicates of the set and put them together.