I eventually got the gatehouse finished. Probably close to sixty hours in total print time but I am very pleased with it.
I was going to do the portcullis, but decided against it as it would be a bit of a faff to lift it up and down. If it was down it would block movement and if it was up then it would stop miniatures getting in the building.
I am going to check the files to see if there any walls to go with it.