I had not heard of the Celts using this term; i assumed it was something from the Greco-Roman sphere only.  According to wiktionary Rammaz means strong (only coming to mean ram in proto-west germanic); now Bukaz does mean buck already so it is kind of plausible. Maybe something like Hand ram: Bagmawaldōz (beam wielders),Gataslahanōz (gate smashers) Covered ram:  Rammabukkaz   That could work. Or something with those verbs?  https://en.wiktionary.org/wiki/Reconstruction:Proto-Germanic/wihslōną  https://en.wiktionary.org/wiki/Reconstruction:Proto-Germanic/saljaną     Also the axeman champion is called Slōgijanōz, maybe could be renamed to Slōgijanaz  (my understanding is -az is singular and -ōz is plural).

Fantastic image!

Salvage then, as has been just discussed: returning something (a ship) to a store (the Dock) and getting store credit (salvageable fraction).

Maybe you guys already decided on something, but what if you could like convert a ship. It is like selling or returning something to a store and getting store credit. You sell you ship back, and some of the wood can be used for another one

No new actors are needed for anything, it's just the present units doing or getting stuff done when garrisoned (unseen).   Simplest would be that it can only be attacked (but the process should be fast enough for this to have no relevant use case). It shouldn't be capturable or salvageable, unless there's a method to stop its ongoing destruction (implying complicating things).