Nice Boat... One thing I will say, do it right the first time and you will have nothing to worry about. Nothing worse than having to do something again that you thought you already had fixed. While a paint job will make it look good, it's what's under the paint that you're worried about.
If you check on tinboats.net you can find anything you want to know about working on them. If you can't find it, someone there can answer your questions. The best site I know of for aluminum boats and working on them.