i don't know what War Hammer is . i'm basing my idea on a table version of this game that people play with little models . i think that's called Battle Tech
The original Warhammer was kinda like Lord of the Rings with goblins and orcs etc. But there is a Warhammer 40,000 where you have space marines (as well as orcs,goblins and lots of other armies) and they use mech-like machines called Dreadnaughts. I used to play them but it is expensive and time consuming so I kind of fell away from it.
i made the top after we had talked about the middle one . took your advice to have less buildings and more open area . the lower image was a test to see how large i could make it . i'm going to try to do something like the top but with more area . i'm thinking i can make a 3x3 grid with the back row being really thick with buildings and the front two rows thinner and thinner