There are so many things you could add to this to make it a better and more contemporary game.
You are right Ian, there is a lot more I could add, and will do down the line...
I think for now I wont stray too far from the original (avoid the wrath of purists) and keep the retro remake similar.
On boat travel I have allowed boats to traverse the uneven Fjords / rivers and they can even pick or rescue Vikings along a route.
I was also thinking about having longboat needing 2 x catapult hits to sink as they are costly to buy???!