I'll agree to all the above except you don't need to name the nodes P0x
Any name for a node will do.
They are after all just placement nodes and care less about what you call them.
They are only used in the manor they are to make things easy to follow
when working on stuff at build time.
And to make another thing very clear?
AI Subs done as Ships in the sim file can be made to dive!
I never finished the final work on this as GWX priorities at that time,
demanded I put that work aside.
I am back into that work for several reasons now.