The Cyclops was never an especially great vehicle to begin with. Well have to see when the multiplayer mod gets updated. I did, however, play the whole game in VR with my brother using the mod (without motion controls / SubmersedVR). So what you'd get out of the Cyclops is that you'd feel big, important, and special for all of five minutes, then you'd realise you had nowhere to actually drive it. The multiplayer mod is just for the OG Subnautica and hasnt been updated yet for the latest version (which is what SubmersedVR uses). There isn't a one-size-fits-all vehicle, your vehicle must suit your environment. It really is like wanting to drive an eighteen-wheeler around a small village, or a jeep through a calm wooded area where people go for picnics. I mean, the Cyclops is so giant, even in the original Subnautica there were plenty of places you couldn't fit it. I've said it before, but this isn't a game where you're out to dominate the depths in a giant, roving castle that-to me-still feels kind of hilariously overcompensatory. Have you considered why you want it? What you'd get out of it? It just doesn't fit here. These aren't long, empty stretches of open land akin to what one might find in the USA's Midwest. You can try, but it's really not going to work out. It's like wanting to drive an eighteen-wheeler around a small, sleepy European village.
Where would you drive the Cyclops to, Zak? The worldspace isn't designed for it.