Don't worry; late medieval technology isn't
that advanced. Although we might want to tweak it a bit for our campaign setting though. Wouldn't be interesting if we got too historical now, would it?
Oh, and we might want to throw in some politics into the mix. Maybe we could start with feuding guilds or trade embargoes or something like that... On land, that is. Watching the plot develop to see how those'll figure out with Atlantean problems should be interesting, in my opinion.