It sure looks unstable in rough seas...
Don’t think those solid looking areas up high are as solid and “heavy” as they appear, I imagine it’s mostly just panels to reduce the amount of reflection they would otherwise get from masts and framework supporting a bridge, etc., that they cover, so there is likely a lot of air space within. The weight is going to be below, like a conventional ship.
Now, I would wonder how it would handle in hurricane force winds with all that surface area.
It’s one thing to reduce radar signature but you also have to reduce heat emissions so you have to shield hotspots, too.
Maybe we could help pay for the things by selling companies billboard space on them. There’s lots of that!