I got it. It is a really good model, and for my first post here (after being a member about 4 years), I'll copy over what I posted at Small Scale HQ.
Finally painted the 50's and the M60 black. Painted the Mk18 a dark OD green. I don't have any Vietnam figures, but I'm trying to put some modern Joes in that I think work for now.
Shipwreck in the coxswain's stand
Female sailor about to load and man the front 50's
A couple of fellas on the rear decks
I got a 6C 3000 mAh NiMH battery. The instructions say to put the battery between the motors, which doesn't make a whole lot of sense given that would throw the center of gravity, if the battery would even fit. Rafael Lopez is a developer at Proboat and he has a video on youtube that clears up the confusion. The receiver for my boat is a little far in from the side, so the red rectangle in this pic shows how I install my battery for the best balance.
A couple of days ago I took the PBR to a great pond at George Bush Park in far west Houston. The wind was a little much. Despite getting blown around like crazy, it handled very well. I took it up to top speed once, and only for a few seconds. It was ridiculously fast! Proboat says the top speed is 15 MPH. Calculate that for a 1:18 scale boat, and keep in mind the actual PBR's topped out at a little over 30. Anyone remember "Ludicrous Speed" from Spaceballs? I had no problems with water getting into the hull, though if you pull some hard turns at a good speed, I imagine it'll get some. All the while, my Shipwreck figure stayed in the coxswain's stand and never fell. All I did was sort of wedge him in standing with his back against the back panel and his arms pushing on the controls.