the way I see it, there are 2 opposite options.
You have a decent amount of space on your boat (say, cat over 45 ft.) and with some thinkering, it could be set as a bar with dedicated insulated space for beer fermenting and serving. I would still skip bottling (no bottle conditioned ales). Either simple pump or more complicated CO2 carbonation.
(COST IS NOT AN ISSUE, QUALITY ENTERTAINMENT IS)
If the space is limited, with some determinaion, I would guess, it is still possible to make drinkable brew from kit, maybe even skipping secondary fermenter (less washing, only one pot for boiling, one bucket for fermenting) and drink it fast...
I would love to hear about the results from practical experience since I do not intent to try it myself any time soon.