Yes, a raw water washdown is a good idea, I just don't like the idea of a thru hull fitting on a balsa core boat, if not done properly it can cause some major issues, so what I did is plumb a hose over the transom and secured it to the swimgrid. This way no holes in the bottom of the boat, make sure you use an inline strainer to save your pump. You may want to plumb this to your fresh water tank as well so you can use it to flush your engines after use in salt water, just use a couple of ball valves, one on your raw and one on the fresh water line. Good luck.