Looking good and don't sell yourself short on your carpentry skills, they are showing through with all of the templates. Be very careful with the osb you have going on. You may not have any leaks but think of how many times you get caught in the freak rain storms while fishing or tip over the minnow bucket or pulling in a wet fish or get an unknown hole the tarp. Be sure to paint all of your wood with 2 coats of Epoxy Paint. Make sure it's 2 coats and the Expoxy Paint is easier to handle. Then cover it with marine carpet & padding. Remember, osb is like a dry sponge that absorbs water easily.
Keep up the good work!