[mudman]

I really think you should make some cardboard mock ups and tape them in place, just to see if you hit your head on the sides or feel weird walking through them. Judging from your photo I wouldn't go that route if it were my house because I'm tall and so are a lot of my friends, and I have trouble walking straight most of the time, so walking straight through the arch to avoid smacking my head would be hard for me.