Guess the result is at least a bit appealing:
The Idea was to create some tension via the limited number of oilpumps and to restrict movement without making a pure defensive strategy/eagling too viable - since the walled areas are thin, it shouldn't be to hard to break defensive structures with artillery. Not sure if it works, maybe i try to host it later on

Would be glad if you give it a shot too, feedback is welcome!
Greetings Dr. Schmock