New Zombie $ Map Feature Idea

After welding a few doors I got the idea, "why aren't there any windows to shoot from?" Then I realized that would be way too OP as you could cluster around a window and unload as they tried to get in. But what if instead of a window there were small slits, just at eye level, that you could shoot through, and make it small enough that only one person can stand in front of it and be able to effectively shoot out of it.

I still thought this would be alittle too OP, but what if you were to add in a different type of zombie? One that is long short and thin, similar to a centipedes body. With such a zombie you could have it be able to crawl through those small window slits and get at the people on the otherside. Perhaps you could also give it the ability to latch on to a person's face and do some moderate damage, if they happen to be standing at the window. I think you could also give crawlers the ability to attack through it, though not actually move through it. I figured such a centipede like zombie type could spawn in unusual places like the crawler does, so they can often get the jump after being overlooked.

What do you think? Any corollary ideas? Improvements? Critiques? or just a trash idea?

New Zombie $ Map Feature Idea