Instead of a ship as Dark Elixer collector...
Why not make it an "oil rig" in other word "dark elixer rig"
same stats cost hp etc.
Flaw with water/port based buildings. Archers would need to have a further range of attack..
or the port based buildings would then require air troops to now be 100% required in order to 3 star (100%) a base.
and possibly a 3rd solution integrate aquatic troops. Thus leading to another question, do they require DE, Elixer, or some new sort of spawning agent similar to our DE/elixer. And either adding a new barracks or adding new troop(s) to barrack already established.
just some more things to think about. Gotta cover all the bases. Otherwise overall rather interesting post.
Keep the great ideas coming Clashers that's what helps supercell, clash of clans evolve.
:D