It seems reasonable to me . Despite Ballynahatty not being open to east and lacking " circles ".It looks like all there is to go on is the word of Wright . If he suggests that it was open to the east then in the drawing has the opening facing ,what is usually south ,he could easily have mixed up other stuff , but that may have been been due to another reason .I have never seen his book but it would be interesting to see how accurate his accounts of the other sites in Louth are like . If we know where the putative site was then excavation should turn some answers particularly if it had stones .