Jordan Perry (and the rest of the Time Isles collaboration team) October 7, 2017 youtu.be/tam2hajlcbU Time Isles Collaboration, BrickCon '17
Great collab. I'll have to go back and watch the rest as 25min is a lot to digest!
Also, in regards to your castle having round AND square towers, it is totally feasible (and exists from a quick google). Although the building techniques were from different times, people often forget that castles were built over long periods of time, or adapted and repaired over time, so seeing changes in building styles is not unrealistic