Corner Window... Partial Curve

[Chris Grantham]

So I am trying to put in a corner window where one portion of it will be in a curved wall. I am planning on using storefront here, but I am having a heck of a time trying to get this to clean up. Also the window is showing up with a dark gray material on it. I have added a picture to help clarify what I am talking about. Note that the grooves taken out of the wall were done with SEOs, I am not sure if this is relevant but I thought that I might mention it. Thanks for your help!

-Chris