Hey Lance, a common solution to your self draining floor up here in Maine is to drill holes sized for rubber plugs that cam shut. They have a lever that squeezes them when flipped, making them larger, plugging the hole. These can be purchased in the US at any decent boat shop, and are common equipment on dinghys, aluminum skiffs, etc.I presume you have them in NZ as well. When you get to the boat, you install the plugs, preventing water from entering while you are using the boat. At the end of the day, you remove them, allowing rain to flow out of the boat. They are so common here, that I always assumed that anyone building this boat would install them without a second thought. I certainly plan to. I haven't looked, but I am sure that both West Marine and Defender carry them. You probably already know about these. Hope this helps.