on the bigger holes buy some sheet metal and cover the inside of the hole weld in place then if you are worried about the bottoms appearance fill it in and grind and sand smooth a good marine enamel will work for paint. I do not know how much access you have to cheap metal if there is such a thing now days but it will be hard to stay away from wood completly if there are any lose rivits be sure to spot weld those as well to save time in the future. watch your boat weight as you build a friend of mine built his own dream boat with every thing he thought he wanted only to launch it and it set with just 6 inches above the water line. be sure to leave drainage channels to the plugs it is going to take on water sooner or later so they need to be there. good luck.



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