Burnchurch Castle, County Kilkenny
This furnishes a natural gable at both ends of the roof as well as an additional defensive level of battlements. There are numerous narrow rooms in the walls, including a "secret room" on the fourth floor. The rounded chimney may be a later improvement [that on the model is square], and the fireplace in the 5th floor Hall sports a "joggle voussoir arch", whatever that is.
The castle originally had a bawn with a 41 foot tall tower at one corner. Though the old drawing, date unknown, shows remnants of buildings, only the round tower [see both below] appears to be standing in pictures I found on the internet and in a library book. Burnchurch was apparently last occupied in 1817, but it can be explored.