The first "proof of concept" video of Oceana for the CCC with the 70's music was shot in Virtual Sailor. It's a simple game that includes more flexible camera movements opposed to SSE, so I was able to take shots from angles that SSE cannot.
I originally intended the navigation mast to be accessible for walktrough where people could enter the mast area by clicking on the steel door on the base. I'm not sure why VSTEP didn't implement any walktrough on that spot since it wouldn't matter for the required CPU power.
As for the atrium and interior stairwells. These were modeled entirely and gave access from the bridge to boatdeck, and from the pool area to the sundeck with the atrium attached to it.
This area however had to be changed by VSTEP for optimization reasons.