I played the game a while ago and ended up building a nice endgame base. It lives on a small island far from the initial spawn point. I had tried to keep the terraforming to a minimal, but I still had dug out a nice port.
Now that Mistlands is out, I'd like to regenerate the same map(save seed) so that it has the updated mistlands areas and all the smaller changes (mountain caves etc) but I want to keep the base. Ideally I'd like to be able to save only the endgame base and its terrain modifications, then apply them to the newly generated map. The idea being to set the result up on a server for some friends with a couple of clues to how to get to the base....

So I'm wondering if there is an easy way to save the buildings and the terrain modifications?
Which mod(s) would be best if I don't want to have to have them installed for the map to work.

Note: I regenerated the world and verified that the island actually does have the same "look" as what it used to before my base.

Cheers