Howdy Lego(TM) fans!

 Would you believe this is my first blog post ever?

I'm building a little stadium and I have a problem I can't figure out. I know there are a lot of smart and experienced builders out there, so maybe you can give me a little help. The stadium has this huge arched window, and I just can't seem to get the arch design right. Here are a couple pictures cribbed from http://www.in.gov/iscba/media/.

 

The arch spans 54 studs and rises 4 to 4.5 studs (3 1/3 to 3 2/3 bricks). Right now I have the glass flush with the wall, but it doesn't have to be. I can set the glass in one stud, and/or the arch can protrude from the wall. I tried using black plates to form the arch, but it just isn't as smooth as I'd like. Here's a picture of that attempt tacked on temporarily.

 
Ideas?

Preview

Stadium north window closing

Stadium north window opening 

Stadium north doors opening and closing