It would actually be really easy if we could have fourth story walls. I'm also a completely NoCC kind of a builder, but I can see using a custom roof decoration for that, like the two Spanish style ones currently in game, since it's not really roofing. Still, I have some thoughts on how to replicate that sort of shape. I will try it out and get back to you.
I'm still around. I'm just hoping for some new building elements for inspiration, and meanwhile working through Dragon Age. Any building I start lately just looks like a version of something I've already built.