Curved building with flat windows?

[Rukus.]

I'm trying to construct a replica of this building. I know for a building such as this shape the arch tool would usually be used, but the placement of the windows keeps me from doing so, I already attempted making an arch manually, but it didn't line up right http://yfrog.com/npcurvej. This is an important part of the map because I want to create a replica more than I want to create a map for playing on. Could I get some help on this?

Also, yes, that building is what you think it is ;D

 

[Passerby]

make it modular.

build the windows piece including the wall above and below it than build the piller that go in between than just copy thing and drag them around.

it's ok the part clip threw one and other a bit if there func_detail or if you just clean up after the fact with the clipping tool.

so just make the pieces you need to the grid than fit it together like lego.

if you look at your reference it is done that way too except for the top trim which is rounded.