Well, I really AM working on a better system for ships than what we've been given in BX/BECMI. It's just taking a very long time, not least because I keep getting side-tracked by other projects.
I have found these very interesting articles, though.
https://www.cnrs-scrn.org/northern_mariner/vol13/tnm_13_4_29-39.pdf
https://www.cnrs-scrn.org/northern_mariner/vol14/tnm_14_3_57-68.pdf
I don't know that every interesting detail discussed here will make it into my final set of rules, but the knowledge herein is very useful for making rulings.