Lighthouse no. 3 became Pendeen Watch, thanks to Stephie; lighthouse no. 4 is based on Märket, one of the Finnish lighthouse on the original inspiration picture: it seemed only fair to let one of them sneak in. I don't know if I'm going to get it right though - I think I won't know until I've added the rest of the lighthouse.
This is how it started:
The attached building (on the right) stops here but there's more to go on the left. This is a lot more fiddly than the last one!