Yeah they are kind of cute! The neolithic section of the Ulster museum is in two small sections but nicely presented. They have a short video on constant replay of various sites from the air and I saw one nice looking court tomb that I thought would be a must see. It was only after I got home and saw on their website its been relocated to just outside the museum!

Thanks for the info on the passage tombs, I'll leave it as it is for the moment seeing as how its just as confusing as most other sources, a consistent guess-timation.