Last time I used two hammerheads. That was both overkill, and pretty awesome -- I don't think anyone had a problem with it. Part of the point was to see what nasty crap you could put in 500 pts, right?
Allow flyers......we'll see what happens. But then yes, you have to allow fortifications....and yes I might very well take a bastion. Find a way to deal with it!
I just do't think you can take this stuff too seriously, it's half for yucks.
Oh, btw, Demons will totally kill you all.