It's perfect! Don't worry about the windows, if it's too much hassle, they're quite alright. But I would really like to have a door at the towerbase... would that be possible? I've attached a photo of an old Dutch chapeldoor, just for the idea. Something less elaborate would do, and preferably with one half of the dubbel door opened! Looks more inviting.
I found another interesting photo, I once made in France. I don't seek for this as a model, but perhaps you'd like to have this reference for some spare hours. It's a very strange ruin, very intriguing. I do have one or two other (much simpler, Stone Age farms) things on my wanting list, so I hope I may get back to you one day. Give me a quote if you like.
I look forward to an .obj with door if possible!
---Dune