Duh. OK. So, sometimes it takes a few minutes to sink in and understand what I've really gone and done. All these pieces amount to are TLX balconies with TLX tab slots cut out. Well, almost.
I'll spend a little more time thinking through my plans here. I think there's more flexibility to being able to use tab slots rather than have a built-on railing, but it won't "just work" for angled balconies. The textures that wrap the piece *would* need redesigning though, but that's not a difficult task.