Using references from AC: Origins, I reconstructed the exterior of the Lighthouse of Alexandria, around the same time as the Drogon build. I've had to make some adjustments to the windows.

As those who've played the game or studied the Lighthouse, each wall has (or should have) a different number of windows; maximum being around 8 and minimum 5-6 (depending on sources)

I couldn't get this to work perfectly, so, for now, they are all 6 windows on each wall, but with intent to rectify this and make it more accurate.