Man, great castles. I think you and your friend have done wonders with that first one - and you've even managed to make that pirates baseplate relevant, which is no mean feat!
The Tan and Gold castle is very cool, quite a common shape for a micro castle, I have done one myself. I like the Gap you have left under the roofs of the second castle, gives the impression there is an outdoor viewing area. Welldone. ~Thoy