Ouch! My boat is identical to yours, so I'm feeling the pain here.
I don't think you need to worry about the transmission; if the prop shaft did that damage, it's all due to external components. The Prop shaft bolts onto the transmission on the fuel tank side; if the four bolts there broke, I think you'd see what you've got there. That wouldn't involve any tranny work.
1998 Maristar 200VRS