Here's some more info for painting & research:

1) PT Boats at War - World War 2 to Vietnam. Norman Polmar & Samual Loring Morison. MBI Publishing ISBN = 0-7603-0499-9
2) PT Boats in Action. By T. Garth Connelly Illustrated by Joe Sewell. Squadron/Signal Publications Warships #7 ISBN = 0-89747-312-4

You can go to almost any bookstore & order using the ISBN or try online. I have built a few PT Boats & these books are invaluable. They show everything from early to late weapon installation to paint schemes to deployment & final history on each boat.

Also, if choosing a battery make sure to take weight into consideration - you don't want your boat running as low in the water as the boat in that video. You want the boat to 'get on step' & rise up out of the water when running. This will not only help in scale appearance but also run time since you are more on top of the water instead of trying to push through it. I like to use a smaller gel battery that can be mounted in any direction stuffed forward in the hull. I always build the bottom separate from the top. Install all of the running gear & only remove what you have to to get it painted. I paint the top separate from the bottom. Then install the decking & top & touch up the seam if necessary where they meet.

Good luck!