Let's face it the most economic way would be to just buy a rise and fall bracket and hang a long-shaft o/b on the back - job done! The Slug is such a stubby little boat that with a long-shaft you would have to have the bow underwater before the prop would be out of the water the other end. And in any case as you have always expounded If its that bad I wont be out! You can then remove The Beast and either not worry about it ever again,restore it or sell it.
Green Bay Auckland New Zealand
"Time And Tide Wait For No Man"