Now I too have seen pictures of Sea Shadow. To me, it doesn't seem like a very tactical vessel, not that I think it was intended as such. Some of you may be curious on Smyge, so here I include an old article of mine. It is not a prototype for our next generation combat vessels, for one thing it is too small, and the weapons fit is not representative for a ship this size, but it has a little of everything for evaluation purposes.
Configuration is a side-keel hovercraft, mostly manufactured of kevlar and glassfibre.
It is designed to reduce radar, IR and noise signatures. All structures consist of angled flat surfaces and all in- and outlets are screened, the engines' exhausts are cooled and the use of water jets makes for a small noise signature. This also makes it relatively insensitive to underwater explosions. It has conformal and retractible antennas, including the elevating radar mast. The barrel can be depressed into the hull and covered by a hatch.