You can't make a land unit from a air unit because tanks could go over the sea and you can't make it from a sea unit either because it would still be on sea. This would be a kinda big change to the game but what if instead of sea and land, you could make it land and mountains? (sea->land) (land->mountains) The ships picture will be changed to the land unit's picture (that way the game still thinks they are sea units moving on sea) Get rid of the ships and water completly.
Possible? or is this too confusing?

