I’ve taken a look at your ingame progress so far and just have a few pointers.
i) Much deliberation was spent on this, but the towers might be a bit too sturdy. If you look at where you’ve placed the wall, it’s on higher ground. This means that, over at least 1600 years, weather would have eroded away the ground the towers have stood on and many of them would have collapsed due to lack of support. This doesn’t have to be a full scale destruction, but more like half of the tower collapsed, leaving the other half precariously standing. Look at the points were the towers have little to no real ground underneath them, such as the tower on the left of the road leading up to the fort. Don’t assume or expect that every tower has to be left standing. These are ancient, abandoned ruins that are unexcavated. They’re meant to be next to unrecognisable.
ii) There are some areas of the towers that do need to be removed, such as small pieces jutting out. Repeated battering by wind and rain, plus gravity, would ensure these don’t exist.
iii) The walls, because they are so thin, might be more mound-like, rather than recognisable.
iv) Remember to look at your towers, the thickness of their walls, and the supports inside to decide how study they would really be. The massive tower that is completed is mostly fine, but think about the extra weight the roof would have on it.
v) Do remember not to make the walls of the houses too high. One block is more than enough in some cases. Be very careful not to make this unrealistic in order to make it recognisable. Further, the larger the house, the less of it there will be. It sounds odd, but this is because the roof would have collapsed fairly quickly.
Overall, fairly good start, just remember to take into account things such as the age of the ruins, weather over the last 1600 years, support etc.
