Well, I finally put in a ery rough sampan, and it works, but horribly. Boats in the game do not float on water, they just sit at the median water level and do not displace anything. The waves rise and fall, and any part of the boat interior below the water level will be covered by the water...especially during the rise of a wave. If you notice, the PBR sits high in the water, and you never see anything below the water level. The floor in the boat is high enough above the waterline so this dosn't present a problem. I had problems with the LSSC since it, like a sampan sits low in the water. The floor of the boat sits below the water level so the water is in the boat... especially during the "wave" action in the game. Also when stopped, the boat sits even lower in the water, almost submersing the whole thing. If you fix that, even at 10 knots, the sampan hovers over the water at speed. The LSSC being much faster, hovers over the water when it's brought to full speed. I did fix this by adding a false bottom in the lssc to try and fix this, and it worked pretty well.
The sampan is "fixed" but doesn't look great since you have to make it taller than normal, and when totally stopped, water still sits in the bottom. At night it looks pretty sweet though shooting a flare over a river on Ia Drang, seeing 3-4 fully loaded sampans, then lighting them up.
No, no screenshots. If anyone knows a good way to take screenshots when the printscreen button doesn't do the trick, let me know. I have a G4 Ti, and for some reason after I installed it, I can't printscreen screenshots anymore, and Fraps doesn't work either.