Hi Andy. I usually add the version number in the title of each BATShips.pdf. Guess which is the only one I didn't do it for? So unfortunately I can't remember which version of BAT the container ships were added to. Pdf was created in March 2021, so all I can say is that the release would have been shortly after that date. Also, I did not keep my files once vampire had integrated them into BAT.
Oh, whatever you do, don't start looking at the slots I used over the years! That way madness lies! I do not have the ability to create slots myself, so quite often used slots from other vessels to implement different ships instead. Wherever possible I would use a slot across eras e.g. a JTW in WAW, which avoided any conflict due to the modular nature of BAT.
I do remember using the Ark R09 slot as it had never been implemented in BAT. So essentially it would have been sent as the Ark Royal R09, but with the container ship 3do files, then integrated into the BAT version by vampire at that time.
Sorry that I can't help you any moire than that, you are asking me to remember what I did three years ago when recalling last week can be a struggle...