Re: steam launch, or sailboat hull to electric
Dan Pence of Portland Oregon built an extremely successful electric launch using the Elliot Bay Steam Launch hull as the basis. Dan is a friendly and helpful guy who would be a great resource for you in building a similar project. David G here on this forum lives in Portland too and knows him--he should be able to help you get ahold of Dan.
Be sure to check out my upcoming book: Satan's Sailboat--How the Flat-Bottomed Sharpie is a Clear Sign of the Coming Apocalypse, available soon on Kindle and in bookstores near you.