Thru the hull at the bottom and extends into the water and straight to a prop? If so, that's a true Inboard. Engine and trans are "inboard" with only the prop "outboard" i.e. underneath . . . Very common and probably a Velvet drive Transmission.The drive shaft goes thru the floor.
Most prop repair shops that I have dealt with, can also make shafts, repair bent struts, rudders etc.