Yes, you could do it like that. I did separate urban bases for my 6mm WW2 for Rommel, to replace units in BUA. At the moment I'm using scatter terrain to integrate the bases a bit more. So, in the above photo, maybe only the large woods, village and one of the plantations is 'real' terrain, and the rest is for scenic effect and can be moved around. Obviously that kind of thing is easier in a division level type game than a smaller one. And is easier with a grid-based game like Rommel.