[kevinp]

So the bunkers with large roof and a place for a flak can be converted into flak towers by changing the word to "mountain" in static.ini?

Yes & no.

It doesn't work with complicated shapes. Symmetrical objects are also a problem. I am still experimenting to find the limitations.

I'm not interested in Flak Towers but TurkeyDriver's post has made me excited about the possibility of making my own working bridges. I'm working on a railway viaduct at the moment.