Welcome again. Well. I transfered water stream nodes from wonderful Rubini's mod to XXI submarine model today.
I use nodes from IXb submarine for XXI. Look's like the game runnig good. No crash.
At the moment it look like this:

But adjusting the correct place for the each node on the XXI hull (to corect holes in the XXI hull)? I think it will be HORRIBLE WORK for me, and I don't know if I can do this!

But I will try