There is a Build Watchtower ability in the game, the Builder in the 1.4 patch has it. I don't know the mods well, perhaps the Pioneers have this ability in some of them.
And they can build bridges (if there is only one hex of water between two land hexes), after you cast Water Walking or Wind Walking on them, or use a ship to allow them to move on water.
@Mods: Please move this to the AoW2/SM modmaking section.
A proud member of the Unofficial Patch team.
Creator of the AoW1 Mod.[This message has been edited by PawelS (edited 02-14-2010 @ 07:02 AM).]