Good Luck
Good luck with the M28oi. I am in the proccess of redoing an M33oi myself. The interior is pretty much up to you. Make patterns and cut bulkheads and make your own cabinets and such. As far as the rudder is concerned you might get the overall dims from another 28 owner or maybe try the morgan websits? Good luck with the project. The outisland series dont sail real well but they are built like tanks and have excellent interior vollume. Patrick