Turning an inboard into a outboard

I am working on a new boat I bought at auction, it is a 21 ft. Grady White cuddy cabin. The engine is a Mercury in line six. The engine was locked up and rusted on the inside and the transom is weak My plan to take the engine out and rebuilt the transom. I know that this is a big job, but if I can complete it I will have a good boat with a new design. I believe that if I replace the inboard with a 90-95 hp outboard engine it should work well to push the boat in the water. As soon as the weather gets a little warmer I plan to start work on the cuddy cabin. I will post pictures of taking out the engine and work on replacing the rotten transom. Hope to start work soon. check back of pictures and description of the work. thanks