Yeah, the terrain around it certainly helps give it a place to fit in which is why in some sense it makes it seem more like a gatehouse which prevents people's passage as it's in the path of a ravine and has an entrance on the one side and presumably can be passed through to the other side too. It doesn't really seem large enough to pose as a castle from what can be seen, but if the inside has a lot more than what's visible in the pictures I could be completely wrong about that. I'd just assumed it had most of the inside relatively visible since it was to display the build. :o I guess technically they could utilise it as a castle if it goes deeper into the mountains on each side. But a fortress works too~. I guess the main focus of the competition is just the design anyhow so if it passes what you count then it's enough. :)

Your build team's members did great here. ^~^ It's nice to see a friendly little competition like this and I'd like to hope there will also be more such ones to witness in the future too.